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<strong>SR<strong>PS</strong></strong><br />

SELECTED READINGS<br />

IN PLASTIC SURGERY<br />

HAND<br />

MICHAEL DOLAN MD<br />

MICHEL SAINT-CYR MD<br />

VOLUME 10: NUMBER 25<br />

2 0 0 9


OUR EDUCATIONAL PARTNERS<br />

Selected Readings in <strong>Plastic</strong> <strong>Surgery</strong> appreciates the generous<br />

support provided by our educational partners.<br />

PLATINUM PARTNERS<br />

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Editor-in-Chief<br />

Editor Emeritus<br />

Contributing Editors<br />

Senior Manuscript Editor<br />

Business Managers<br />

Corporate Sponsorship<br />

Jeffrey M. Kenkel, MD<br />

F. E. Barton, Jr, MD<br />

R. S. Ambay, MD<br />

R. G. Anderson, MD<br />

S. J. Beran, MD<br />

S. M. Bidic, MD<br />

G. Broughton II, MD, PhD<br />

J. L. Burns, MD<br />

J. J. Cheng, MD<br />

C. P. Clark III, MD<br />

D. L. Gonyon, Jr, MD<br />

A. A. Gosman, MD<br />

K. A. Gutowski, MD<br />

J. R. Griffin, MD<br />

R. Y. Ha, MD<br />

F. Hackney, MD, DDS<br />

L. H. Hollier, MD<br />

R. E. Hoxworth, MD<br />

J. E. Janis, MD<br />

R. K. Khosla, MD<br />

J. E. Leedy, MD<br />

J. A. Lemmon, MD<br />

A. H. Lipschitz, MD<br />

R. A. Meade, MD<br />

D. L. Mount, MD<br />

J. C. O’Brien, MD<br />

J. K. Potter, MD, DDS<br />

R. J. Rohrich, MD<br />

M. Saint-Cyr, MD<br />

M. Schaverien, MRCS<br />

M. C. Snyder, MD<br />

M. Swelstad, MD<br />

J. F. Thornton, MD<br />

A. P. Trussler, MD<br />

R. I. S. Zbar, MD<br />

Dori Kelly<br />

Grafts and Flaps<br />

Wound Healing, Scars, and Burns<br />

Skin Tumors: Basal Cell Carcinoma, Squamous Cell<br />

Carcinoma, and Melanoma<br />

Implantation and Local Anesthetics<br />

Head and Neck Tumors and Reconstruction<br />

Microsurgery and Lower Extremity Reconstruction<br />

Nasal and Eyelid Reconstruction<br />

Lip, Cheek, and Scalp Reconstruction<br />

Ear Reconstruction and Otoplasty<br />

Facial Fractures<br />

Blepharoplasty and Brow Lift<br />

Rhinoplasty<br />

Rhytidectomy<br />

Skin Care and Cosmetic Injectables<br />

Lasers<br />

Facial Nerve Disorders<br />

Cleft Lip and Palate and Velopharyngeal Insufficiency<br />

Craniofacial I: Cephalometrics and Orthognathic <strong>Surgery</strong><br />

Craniofacial II: Syndromes and <strong>Surgery</strong><br />

Vascular Anomalies<br />

Breast Augmentation<br />

Breast Reduction and Mastopexy<br />

Breast Reconstruction<br />

Body Contouring and Liposuction<br />

Trunk Reconstruction<br />

Hand: Soft Tissues<br />

Hand: Peripheral Nerves<br />

Hand: Flexor Tendons<br />

Hand: Extensor Tendons<br />

Hand: Wrist, Joints, Congenital Anomalies, and<br />

Rheumatoid Arthritis<br />

Selected Readings in <strong>Plastic</strong> <strong>Surgery</strong> (ISSN 0739-5523) is published approximately 10 times per year by<br />

Selected Readings in <strong>Plastic</strong> <strong>Surgery</strong>, Inc. A volume consists of 30 issues distributed over 3 years.<br />

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issues. Please visit us at www.<strong>SR<strong>PS</strong></strong>.org for more information.<br />

Printed on recycled paper using soy-based ink; 100% recyclable.


HAND:<br />

FINGERNAILS, INFECTIONS, TUMORS, AND<br />

SOFT-TISSUE RECONSTRUCTION<br />

Michael Dolan, MD<br />

Michel Saint-Cyr, MD<br />

FINGERNAILS<br />

Anatomy<br />

The nail root is covered by an epithelium-lined sheath<br />

called the eponychium. The dermal layer beneath the<br />

nail is the nail bed. It consists of the germinal matrix,<br />

which underlies the proximal one-third of the nail<br />

from the nail fold to the distal lunula, and the sterile<br />

matrix, which occupies the distal two-thirds of the nail<br />

from the lunula to the end of the nail bed (Fig. 1). 1 The<br />

area beneath the distal free margin of the nail, where<br />

the sterile matrix and fingertip skin meet, is called the<br />

hyponychium. This specialized area contains increased<br />

numbers of polymorphonuclear leukocytes and<br />

lymphocytes. 2 The surrounding soft tissue is called the<br />

perionychium. The perionychium bordering the nail<br />

edges on the sides is called the paronychium.<br />

Nail production occurs in three areas of the<br />

perionychium. The germinal matrix produces<br />

approximately 90% of the nail volume by pushing cells<br />

from the ventral floor upward and outward. As they<br />

reach the surface, the specialized cells flatten, elongate,<br />

keratinize, and stream distally. At approximately the<br />

level of the lunula, the cell nuclei disintegrate and the<br />

nail becomes clear. The loss of nuclei is why it is<br />

referred to as the sterile matrix.<br />

The remainder of the nail substance is produced<br />

by the germinal layer in the dorsal roof of the proximal<br />

nail fold and by the sterile matrix in variable amounts,<br />

as evidenced by a thicker nail at its distal edge than at<br />

Department of <strong>Plastic</strong> <strong>Surgery</strong>,<br />

University of Texas Southwestern Medical Center at Dallas, Dallas, Texas<br />

Figure 1. Anatomy of the nail shown in sagittal (A) and<br />

dorsal (B) views. (Reprinted with permission from Brucker and<br />

Edstrom. 1 )<br />

its proximal root. 2 The dorsal roof of the nail also<br />

provides cells that add shine to intact nails.


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

Physiology<br />

The fingernail protects the fingertip from trauma and<br />

aids in gripping fine objects. The nail resists<br />

deformation of the digital skin and, in so doing,<br />

increases the sensitivity of the fingertip, as shown by<br />

2-point discrimination tests. 2 Where fingernails are<br />

permanently absent, fingerprints tend to disappear<br />

and 2-point discrimination worsens.<br />

The nail grows at an average rate of 3 to 4 mm a<br />

month. Nail growth is faster during the summer than<br />

during the winter and is accelerated in nail biters. The<br />

nail is not attached to its bed but rather “is a<br />

continuum of a single structure from the basilar cells<br />

into the nail”. 2<br />

Injuries<br />

Fingertip injuries are the most common type of hand<br />

trauma, and the nail bed itself is the most frequent site<br />

of injury. 3,4 Destruction of the germinal matrix usually<br />

results in permanent loss of the fingernail or<br />

troublesome nail remnants. 5<br />

Prompt treatment of nail bed injuries is vital to<br />

maintain function and cosmesis. 6,7 Ashbell et al. 5<br />

reviewed 3000 nail bed and root injuries treated during<br />

a 10-year period and formulated the principles of<br />

management for the injuries, as follows:<br />

remove remaining nail plate to assess underlying<br />

nail bed injury<br />

perform minimal débridement of nail bed<br />

stabilize distal phalanx, if required 8<br />

achieve accurate repair of nail bed and any<br />

associated skin lacerations<br />

replace missing sterile matrix with sterile matrix<br />

graft at primary procedure<br />

replace nail plate, if available, or use 0.02-inch<br />

silastic sheet as nail spacer<br />

These principles apply equally to the management<br />

of nail bed injuries in children, in whom good results<br />

can be anticipated in the majority of cases. 9 When<br />

repairing a nail bed in a child in the emergency<br />

department, conscious sedation often is needed to<br />

facilitate accurate nail bed repair. In cases in which the<br />

nail plate is recovered, it can be used to splint the nail<br />

fold but it is recommended that it first be trephinated<br />

to allow for the inevitable hematoma to drain.<br />

Application of Xeroform gauze (Invacare Supply<br />

2<br />

Group, Holliston, MA) under the nail fold can also be<br />

used for this purpose.<br />

When the nail root is not significantly damaged,<br />

complete regrowth of the nail normally is obtained in 4<br />

to 5 months. 5 In the event of partial or total loss of the<br />

sterile matrix, nail grafting from an uninvolved finger<br />

or from a toe 10,11 is possible in the acute setting.<br />

Similarly, chronic deformities such as nail plate<br />

nonadherence and minor nail splitting have been<br />

successfully treated with sterile matrix grafting<br />

procedures. 12,13 Isolated, nonvascularized, germinal<br />

matrix grafts have far less predictable outcomes and<br />

usually are not recommended. If a germinal matrix<br />

graft is to have any chance of success, a large<br />

composite must be taken, which has to include the nail<br />

fold. The nail plate, dorsal roof, and germinal and<br />

sterile matrices are harvested along with a small rim of<br />

paronychial skin (Fig. 2). 1 The donor site from the great<br />

toe is covered with a split-thickness skin graft.<br />

However, in their review of 10 composite grafts<br />

performed during a 10-year period, Lille et al. 14 were<br />

able to obtain good or excellent results in only 50% of<br />

the cases.<br />

Figure 2. Composite nail graft. (Reprinted with permission from<br />

Brucker and Edstrom. 1 )<br />

In cases with significant loss of germinal matrix,<br />

consideration should be given to primary nail bed<br />

ablation. When performing an ablation, the intimate<br />

relationship of the terminal extensor tendon to the<br />

germinal matrix must be appreciated, with the two<br />

structures being separated by only 1.2 mm. 14<br />

Visualization of the insertion of the terminal extensor


tendon represents the proximal limit of excision.<br />

Reardon et al. 15 recommend that excision of the nail<br />

matrix should be rectangular, extending to the midlateral<br />

lines. Microvascular nail transfer is the<br />

definitive method for replacing the entire nail matrix<br />

but is a major procedure for what is as much an<br />

aesthetic as a functional outcome. 16,17<br />

Deformities<br />

Posttraumatic retraction and deformity of the<br />

eponychial fold can occur after lacerations or burns.<br />

One-stage flap options are possible for correction of<br />

this problem. 18,19<br />

In cases in which the nail fold is not properly<br />

stented open, the patient might develop a synechia<br />

and skin pterygium, which can lead to secondary nail<br />

deformities. Prevention by appropriate nail fold<br />

splinting is recommended to avoid the problem.<br />

INFECTIONS<br />

Sixty percent of all hand infections are the result of<br />

trauma, 30% result from human bites, and 10% result<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

from animal bites. 20 Hand infections account for<br />

approximately 20% of all admissions to hand surgery<br />

units and often are accorded a lower level of<br />

significance than warranted. When the infection is<br />

treated appropriately, the patient returns to optimal<br />

function in a short time. If the infection is inadequately<br />

treated, the patient is resigned to pain, stiffness, and<br />

disability. Amputation is sometimes required in<br />

extreme cases.<br />

Microbes and Antibiotics<br />

The most frequent pathogen involved in hand<br />

infections is Staphylococcus aureus, accounting for 50%<br />

to 80% of all isolates. 20–25 The microbes, unfortunately,<br />

are likely to be resistant, as shown in multiple<br />

studies. 26,27 However, specific aspects of the history<br />

and/or physical examination findings can implicate<br />

other organisms as the inciting agent. Careful attention<br />

to the aspects and findings allows the physician to<br />

make an appropriate choice of initial antibiotic(s) to<br />

cover all reasonable pathogens (Table 1).<br />

Indiscriminate use of excessively broad-spectrum<br />

Table 1<br />

Empiric Antibiotic Treatment for Some Common Hand Infections24 Infection Antibiotic Likely Organisms<br />

Cellulitis/lymphangitis First-generation cephalosporin<br />

or<br />

antistaphylococcal penicillin<br />

Paronychium/felon Dicloxacillin<br />

or<br />

fi rst-generation cephalosporin<br />

Flexor tenosynovitis β-Lactamase inhibitor<br />

or<br />

fi rst-generation cephalosporin<br />

and penicillin;<br />

consider ceftriaxone<br />

Deep space infection β-Lactamase inhibitor<br />

or<br />

fi rst-generation cephalosporin<br />

and penicillin<br />

Human bite wound β-Lactamase inhibitor<br />

or<br />

fi rst-generation cephalosporin<br />

and penicillin<br />

Dog or cat bite wound β-Lactamase inhibitor<br />

or<br />

fi rst-generation cephalosporin<br />

and penicillin<br />

Streptococcus pyrogenes,<br />

S. aureus<br />

S. aureus, anaerobes<br />

S. aureus, streptococci, anaerobes;<br />

Neisseria gonorrhoeae<br />

S. aureus, streptococci,<br />

gram-negative bacilli, anaerobes<br />

S. aureus, streptococci,<br />

E. corrodens, anaerobes<br />

S. aureus, streptococci,<br />

P. multocida<br />

3


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

antibiotics can expose the patient to unnecessary side<br />

effects and complications and can promote the<br />

development of resistant strains.<br />

Infections with Streptococcus species present<br />

rapidly, with marked cellulitis and possibly<br />

lymphangitis. Although an antistaphylococcal<br />

penicillin or first-generation cephalosporin adequately<br />

cover S. aureus, streptococci are better covered by<br />

penicillin. Gram-negative infections might present with<br />

a cellulitis or purulent infection. Anaerobic bacteria are<br />

especially common in bite wounds, infections<br />

associated with intravenous drug abuse, and diabetics.<br />

In addition to the bacteria already mentioned, Eikenella<br />

corrodens is found in many human bite wounds 28–30 and<br />

Pasteurella multocida in many domestic animal bite<br />

wounds. 31–34 These usually are adequately covered by<br />

the addition of penicillin to an agent effective against<br />

the other gram-positive organisms. 35–37<br />

Compared with adults, children are more<br />

susceptible to unusual pathogens and have a higher<br />

incidence of oral flora, Pseudomonas aeruginosa, and<br />

Haemophilus influenzae 38,39 associated with infections.<br />

However, the associations probably are not frequent<br />

enough to warrant a change in the initial therapy for<br />

routine infections. Nevertheless, if suggested by gram<br />

stain, if a site of distant infection is present where the<br />

pathogens are common, or if the infection does not<br />

respond promptly to the standard antibiotics,<br />

additional coverage is warranted. The presence of<br />

multiple pathogens in hand infections is probably<br />

more common than is appreciated. 40<br />

If the patient is receiving recalcitrant to<br />

conventional antibiotic therapy, methicillin-resistant S.<br />

aureus (MRSA) must be considered. Cultures should be<br />

obtained, and an antibiotic that covers MRSA should<br />

be initiated. 27,41<br />

Prophylactic Antibiotics<br />

Three independent studies 42–44 showed that<br />

prophylactic antibiotics do not avert infection in cases<br />

of hand lacerations. Meticulous wound débridement<br />

and care are preferred over the routine use of<br />

antibiotics in cases of hand injuries. 45 Fitzgerald et al. 46<br />

recommend prophylactic antibiotics for hand wounds<br />

of home or industrial origin but not for farm wounds,<br />

which instead should undergo thorough débridement<br />

4<br />

and culture. Nylén and Carlsson 47 found no correlation<br />

between severity of infection and number of organisms<br />

present in wound or time elapsed before treatment (up<br />

to 18 hours) and further emphasized the importance of<br />

wound débridement in the care of hand injuries.<br />

Prophylactic antibiotics do have a role in cases<br />

undergoing the following procedures: 1) soft-tissue<br />

reconstructive procedures with large flaps, 2) total elbow<br />

or wrist implant arthroplasty, 3) procedures of long<br />

duration, 4) complex open hand trauma with wound<br />

contamination and extensive soft-tissue and bony injury,<br />

and 5) procedures longer than 2 hours in duration. 45<br />

For routine surgical cases in which more than 2<br />

hours of time elapses and prophylactic antibiotics are<br />

recommended, the choice of antibiotic typically is a<br />

first-generation cephalosporin. This typically is<br />

administered as cephalexin four times a day, but new<br />

evidence shows that administering the same total<br />

dosage in two doses is equally effective. 48 The duration<br />

of the administration of the antibiotics is unclear, but<br />

the literature does show that if the time period exceeds<br />

4 days, the antimicrobial resistance is altered. 49<br />

Management<br />

Although the spectrum of acute bacterial hand<br />

infections is broad, the management principles are<br />

similar for all and can be summarized as follows:<br />

rest, elevation, and immobilization in position of<br />

function<br />

adequate drainage of all loculations of pus and<br />

débridement of necrotic tissue<br />

antibiotics, determined by sensitivities from<br />

aerobic and anaerobic cultures (obtained before<br />

commencement of antimicrobial therapy) and<br />

special cultures—fungi, mycobacteria, viruses—<br />

as indicated<br />

treatment with broad-spectrum antibiotics that<br />

cover for MRSA<br />

tetanus prophylaxis for all penetrating wounds<br />

early, aggressive hand therapy<br />

Common Bacterial Infections<br />

Hand infections can be acute or chronic, but the<br />

overwhelming majority are acute. Of the acute<br />

infections, more than 90% are caused by<br />

bacterial pathogens. 20


Cellulitis<br />

Cellulitis is a common superficial infection of the hand<br />

that presents as erythema, swelling, pain, and<br />

occasional lymphangitis or vesicle formation. Cellulitis<br />

occurs most commonly on the dorsal aspect of the<br />

fingers and metacarpals, and beta-hemolytic<br />

streptococcus is the usual pathogen. Treatment<br />

includes rest, elevation, splinting, and antibiotics.<br />

Paronychia<br />

Paronychia is an infection of those structures<br />

surrounding the proximal and lateral nail. Paronychia<br />

is initiated by the introduction of bacteria between the<br />

nail and its surrounding structures. This usually is<br />

caused by minor trauma, such as nail biting and<br />

manicures. It frequently is reported that S. aureus is the<br />

most frequent isolate in paronychia. Studies have<br />

shown anaerobic bacteria to be present alone or in<br />

combination in a large percentage of cases of<br />

paronychia, 50,51 likely because of the frequency of<br />

contact of the oral secretions with the inciting wound.<br />

Paronychia initially begins as erythema, swelling,<br />

and discomfort at the nail fold, sometimes with<br />

fluctuation and frank purulence. If paronychia is<br />

detected early, warm soaks, elevation, and oral<br />

antibiotics can be sufficient treatment. If the infection<br />

has been present for longer than 24 hours or if any<br />

fluctuance is present under the nail, the nail fold must<br />

be drained by simple elevation (Fig. 3). 52,53<br />

If the initial attempt at drainage is inadequate, if<br />

the infection extends significantly proximal to the nail<br />

fold, or if the infection fails to resolve with the above<br />

treatment, more aggressive drainage is indicated. The<br />

Figure 3. Drainage of paronychia. (Reprinted with permission<br />

from Conolly. 53 )<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

nail plate should be removed because it might be<br />

acting as a foreign body by that stage. It might also be<br />

necessary to incise the dorsal nail fold. Two incisions<br />

are made at right angles to the nail fold, at the 5<br />

o’clock and 7 o’clock positions, to elevate it completely<br />

from the nail bed in the region of the infection (Fig.<br />

4). 54 Accurate placement of the incisions minimizes the<br />

chance of subsequent eponychial retraction.<br />

Figure 4. Incisions in eponychium. (Reprinted with permission<br />

from Zook and Brown. 54 )<br />

If the paronychia has been neglected or<br />

inadequately treated, purulence might extend around<br />

the nail to its ventral surface overlying the nail matrix.<br />

The pressure of the accumulating pus can permanently<br />

damage the germinal matrix, and removal of an<br />

appropriate section or the entire nail is indicated to<br />

adequately drain the infection. Inadequate treatment<br />

might allow the pus to spread under the nail sulcus to<br />

the opposite side, resulting in a “runaround” abscess.<br />

Occasionally, paronychia becomes a chronic<br />

problem, 55,56 perhaps from secondary mycobacterial or<br />

fungal infections, which more commonly occur in<br />

immunosuppressed patients, diabetics, and cancer<br />

patients. Chronic paronychia also occurs in patients<br />

who have frequent exposure to moist environments.<br />

Candida albicans is the most commonly identified<br />

organism in paronychia. 52 Infection can become chronic<br />

in the presence of vascular insufficiency, such as in<br />

cases of Raynaud disease or scleroderma. The chronic<br />

infections can be treated in several ways. The nail fold<br />

can be marsupialized by excision of a crescent of tissue<br />

5


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

down to the germinal matrix, which is then left to<br />

close by secondary intention. 57,58 Alternatively, the<br />

entire proximal nail fold, including the cuticle, can be<br />

excised. 59 Once healed, a very satisfactory cosmetic<br />

result is achieved, although as the dorsal roof of the<br />

nail is ablated, the shiny surface layer of the nail is no<br />

longer produced. Complete removal of the nail and<br />

then treatment with a combined antifungal-steroid<br />

cream has also shown good results. 60 In cases of<br />

nonhealing chronic infection, malignancy should be<br />

ruled out considering that subungual melanoma often<br />

is unpigmented and mistaken for fungal infection. 61<br />

Pulp Space Infection (Felons)<br />

A felon is an infection of the pulp of the distal finger.<br />

The anatomy of the pulp is unique, with 1520<br />

longitudinal septa anchoring the tip to the distal<br />

phalanx (Fig. 5). 53 When infection is present, the septa<br />

can compartmentalize an infection and preclude<br />

adequate drainage if the septa are not fully ruptured.<br />

Figure 5. Anatomy of the fingertip. (Reprinted with permission<br />

from Conolly. 53 )<br />

Most felons are precipitated by some sort of<br />

penetrating trauma, and radiographs should be<br />

obtained of all felons and carefully evaluated for<br />

foreign bodies. If a felon does not respond to therapy<br />

or if strong evidence indicates that a non-radiopaque<br />

foreign body is embedded in the pulp,<br />

6<br />

ultrasonography might reveal a foreign body not seen<br />

on conventional radiographs. S. aureus is the most<br />

common pathogen in felons, 62 but gram-negative<br />

organisms have also been reported. Gram-negative<br />

organisms should be considered in immunosuppressed<br />

patients. A number of cases have been reported in<br />

diabetics who developed felons after checking their<br />

blood sugar level by fingerstick. 63<br />

If a pulp infection is observed early, it might<br />

simply be a case of localized cellulitis or a small<br />

superficial abscess. Localized cellulitis and small<br />

superficial abscesses can be treated with orally<br />

administered antibiotics, rest, and elevation or with<br />

local drainage as indicated. In a case of true felon, the<br />

patient presents with the entire pulp red, swollen, and<br />

markedly tender. The patient usually complains of a<br />

severe throbbing pain, particularly when the finger is<br />

dependent. The pain is caused by increased tissue<br />

pressure, which is caused by the unyielding septa<br />

(essentially a compartment syndrome of the pulp). At<br />

that stage, adequate drainage and antibiotics are<br />

required for treatment. 52,62 Late presentation or<br />

incomplete therapy can result in a compromise of the<br />

blood flow to the pulp, which can result in necrosis of<br />

the soft tissues, tenosynovitis, septic arthritis, and<br />

even osteomyelitis. 64<br />

Many incisions have been recommended for the<br />

drainage of felons. If it is pointing, the felon should be<br />

drained at that site. Careful palpation with a small<br />

blunt probe often determines a point of maximal<br />

tenderness, and the incision should be made at that<br />

site. The pulp must be explored immediately volar to<br />

the phalanx but dorsal to the neurovascular structures.<br />

The fibrous septa are ruptured to allow complete<br />

drainage of the infected space. Good results are<br />

achieved with a longitudinal midline palmar incision<br />

that does not cross the distal interphalangeal joint (Fig.<br />

6). 52,53 The incision heals well and usually does not<br />

produce a hypersensitive scar on the pulp.<br />

Tenosynovitis<br />

Tenosynovitis is an infection within the sheaths that<br />

form the gliding surfaces around the tenons in the<br />

hand. It is almost exclusively a disease of the flexor<br />

tendons, although extensor tenosynovitis at the level of<br />

the dorsal retinaculum has also been described. 65


Figure 6. Drainage of a felon. (Reprinted with permission from<br />

Conolly. 53 )<br />

Although tenosynovitis rarely is life-threatening,<br />

delayed or inappropriate treatment can lead to<br />

devastating consequences. The delicate gliding<br />

surfaces of the tendon sheaths can be destroyed by<br />

infection, resulting in a stiff and painful finger. Even<br />

more prolonged delay in treatment can allow the<br />

sheath to rupture, with spread of the infection to any<br />

of the spaces of the palm or to the adjacent bone.<br />

Prolonged infection can also lead to ischemic rupture<br />

of the tendon itself. 66,67<br />

Most cases of tenosynovitis begin with penetrating<br />

trauma, and in such cases, the most common infectious<br />

agent is S. aureus. Some cases are caused by<br />

hematogenous dissemination, particularly of gonococcal<br />

infections, and this possibility should be considered in<br />

cases with no history of antecedent trauma. 68<br />

The hallmarks of flexor tenosynovitis were first<br />

established by Kanavel 69 and constitute the four<br />

cardinal signs that bear his name:<br />

fusiform swelling of the digit<br />

partially flexed posture of the digit<br />

tenderness along the entire flexor sheath<br />

pain along the entire flexor sheath with passive<br />

extension of the digit<br />

In situations of uncertainty regarding the<br />

diagnosis, ultrasonography might be of benefit 70,71 in<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

that it can show swelling of the tendon and<br />

peritendinous fluid. It is likely that the diagnosis of<br />

suppurative tenosynovitis can be made on clinical<br />

grounds alone.<br />

Once the diagnosis of tenosynovitis has been<br />

made, treatment must be instituted promptly. Very<br />

early cases can undergo a trial of intravenous<br />

antibiotics, splinting, and elevation. That mode of<br />

treatment, however, should be selected with caution.<br />

The patient should be observed closely, and if<br />

significant improvement is not noted within 12 to 24<br />

hours, treatment should progress to surgical drainage.<br />

When surgical drainage is deemed necessary based<br />

on initial presentation or failure to improve, two<br />

methods are available, as described by Neviaser. 67,72<br />

The majority of cases can be treated with limited<br />

incision and drainage and then closed catheter<br />

irrigation (Fig. 7). 21,72–74 If the patient fails to respond to<br />

that treatment or if the sheath cannot be cleared of<br />

purulence at initial exploration, open drainage must be<br />

used. The sheath is opened widely via a midlateral<br />

incision, sparing the A2 and A4 pulleys, and is<br />

copiously irrigated. 66,67,75 The wound is closed loosely or<br />

left open for delayed closure. Active range-of-motion<br />

exercises are begun with the first dressing change on<br />

the ward. 76<br />

Figure 7. Closed irrigation for flexor tenosynovitis. (Reprinted<br />

with permission from Brown and Young. 21 )<br />

7


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

In the event that the thumb or little finger is<br />

involved with tenosynovitis, the infection can extend<br />

proximally to involve either the ulnar or radial bursa.<br />

The two bursae communicate through the space of<br />

Parona, deep to the flexor tendons in the distal<br />

forearm. A “horseshoe” abscess can form where a<br />

flexor tenosynovitis, beginning in either the thumb or<br />

little finger flexor sheath, spreads proximally to the<br />

space of Parona and then passes distally down either<br />

the little finger or thumb flexor tendon sheath. Phillips<br />

et al., 77 however, showed that the little finger flexor<br />

synovial sheath often ends at the level of the A1 pulley,<br />

so that little finger tenosynovitis usually can be<br />

managed by drainage of the finger alone. In instances<br />

in which an infection extends proximally, closed<br />

catheter drainage is indicated. The catheter is directed<br />

proximally from the incision at the level of the A1<br />

pulley. A counter incision is then made just proximal to<br />

the transverse wrist crease, where a drain is placed in<br />

the bursa. This system is managed in a similar fashion<br />

to the digital system. Again, if the patient does not<br />

respond to this treatment, open drainage of the bursae<br />

is necessary.<br />

Deep Space Infection<br />

A variety of “spaces” have been described in the hand.<br />

In reality, the spaces are potential and become<br />

significant only when infected, as they become<br />

loculations of purulent material. They include the<br />

thenar space, the midpalmar space, the subtendinous<br />

space, also known by the eponym Parona space, the<br />

hypothenar space, the dorsal subcutaneous space, the<br />

dorsal subaponeurotic space, and the interdigital web<br />

spaces. 78 The spaces often are confused with the<br />

compartments of the hand, which are the four dorsal<br />

interossei, three volar interossei, thenar, hypothenar,<br />

and adductor pollicis compartments.<br />

Infection in the spaces begins most frequently with<br />

a penetrating injury, the most commonly identified<br />

isolate being S. aureus. An antistaphylococcal agent can<br />

be used for initial antibiotic therapy unless gram stain<br />

at the time of drainage suggests another organism. As<br />

clearly described in the pre-antibiotic era by Kanavel, 69<br />

the key to treatment of deep space infections is precise<br />

drainage of the abscess, guided by knowledge and<br />

respect for the surrounding and involved structures.<br />

8<br />

The most important deep spaces of the hand are<br />

the midpalmar space and the thenar space (Fig. 8). 21<br />

Thenar space infections usually are characterized by<br />

the thumb being held in an abducted position, with<br />

pain over the adductor muscles and pain on extension<br />

or attempted opposition of the thumb. Thenar space<br />

infection is the only hand infection with which the<br />

thumb is not adducted. Drainage of the abscesses must<br />

not only respect the proximity of neurovascular<br />

structures, primarily the radial bundle to the index<br />

finger and the ulnar bundle to the thumb, but also<br />

must prevent scarring across the thumb-index web.<br />

Figure 8. Deep spaces of the hand. (Reprinted with permission<br />

from Brown and Young. 21 )<br />

The midpalmar space, exclusive of the flexor<br />

tendon sheaths, allows free spread of infection along<br />

fascial planes to deeper areas in the hand. Treatment<br />

consists of incision and drainage with catheter<br />

irrigation for 2 to 3 days. 78<br />

Osteomyelitis<br />

Osteomyelitis of the bony structures of the hand is a<br />

relatively infrequent infection. 79 Osteomyelitis can<br />

present as a spontaneous bone infection, usually by<br />

hematogenous seeding from a distant source. The most<br />

likely pathogens are Staphylococcus and Streptococcus<br />

species and, in young children, Haemophilus species.<br />

Osteomyelitis presents as a localized focus of<br />

erythema, pain, and swelling along the course of one<br />

of the long bones of the hand. If the infection does not<br />

show clinical signs of improvement within 48 hours of<br />

commencing intravenously administered antibiotic<br />

treatment, bone biopsy should be performed to obtain


a specimen for culture. Any obviously necrotic bone<br />

should undergo débridement during that procedure.<br />

Osteomyelitis can also develop secondary to local<br />

tissue conditions, either the spread of another<br />

contiguous infection or direct injury to the<br />

surrounding soft tissues and bone. The best test for<br />

diagnosing osteomyelitis under such circumstances is<br />

direct evaluation of the bone in an operative setting,<br />

with a biopsy performed during the same procedure.<br />

The biopsy also provides a culture to guide the<br />

antibiotic therapy. A superficial swabbing of the<br />

wound is inadequate for diagnosis or culture, because<br />

the pathogens obtained by that technique might not<br />

accurately reflect the microbiology of the infected<br />

bone. 80 The initial antibiotics should be broad-spectrum<br />

parenteral antibiotics until the results of the cultures<br />

allow specification. 81<br />

In a review of 46 patients with osteomyelitis of the<br />

metacarpals or phalanges, Reilly et al. 82 noted an<br />

overall amputation rate of 39% despite aggressive<br />

surgery and intravenously administered antibiotic<br />

therapy. A delay of more than 6 months from onset of<br />

symptoms to diagnosis and definitive treatment<br />

resulted in amputation in six of seven patients.<br />

Septic Arthritis<br />

Infection of the joint spaces of the hand can cause a<br />

devastating loss of hand function because it threatens<br />

the cartilaginous surface of the joint. 83 Septic arthritis<br />

can present as a primary site of infection or as a<br />

complication of another hand infection, the most<br />

common of which is an acute flexor tenosynovitis.<br />

Isolated septic arthritis can occur either by direct<br />

inoculation or by hematogenous spread from a distant<br />

infection. Distant sites of recent infection must be<br />

sought, particularly in the patient with no history of<br />

trauma. 84 In children, monoarticular arthritis often is<br />

caused by hematogenous spread from a distant<br />

infection. In addition to Streptococcus and<br />

Staphylococcus species, H. influenzae must be considered<br />

to be a common potential pathogen and covered<br />

appropriately. In the sexually active patient,<br />

particularly those younger than 40 years with no<br />

history of direct inoculation, gonococcal arthritis must<br />

be suspected. 85<br />

Septic arthritis in the hand presents as a locally<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

tender, erythematous, and swollen joint. Because of the<br />

swelling and pain, the joint is held in the position that<br />

maximizes its volume, approximately 30 degrees of<br />

flexion in the interphalangeal joints and full extension<br />

in the metacarpophalangeal joints. The joint is<br />

particularly tender with any passive motion.<br />

Arthrocentesis of the joint can be performed as a<br />

diagnostic maneuver. Treatment consists of elevation,<br />

parenteral antibiotics, and incision and drainage of the<br />

joint. Depending on the severity of the infection,<br />

irrigation of the joint for 48 to 72 hours might also be<br />

required. Once the acute inflammation has abated,<br />

range-of-motion exercises should commence.<br />

Bite Wounds<br />

Human Bite Wounds<br />

Bites to the human hand account for 20% to 30% of all<br />

hand infections, and the majority are human bites. The<br />

clenched-fist injury is associated with a high incidence<br />

of complications, including stiff joints and even<br />

amputations. 86,87 The injury is sustained as the clenched<br />

fist strikes the mouth of another person, and the tooth<br />

frequently impales the metacarpal heads. The key<br />

point in understanding the potential of the underlying<br />

Figure 9. A, Tooth pierces clenched fist, penetrating skin,<br />

tendon, joint capsule, and metacarpal head. B, When finger is<br />

extended, four puncture wounds do not align. (Reprinted with<br />

permission from Lister. 91 )<br />

9


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

pathological condition is that the site of penetration of<br />

the various layers is relative to the position of the fist<br />

at the moment of impact (Fig. 9). 88–91 The hand must be<br />

assessed in the clenched-fist position to allow an<br />

accurate assessment of the depth of injury.<br />

The patient presenting early with a laceration or<br />

puncture has minimal inflammation. Radiography<br />

might reveal a fracture of the metacarpal head, air<br />

within the joint, or, occasionally, a foreign body such as<br />

a broken tooth. The patient presenting late has a red,<br />

swollen, painful hand and can have associated<br />

lymphangitis and regional lymphadenitis. The patients<br />

are constitutionally unwell, with fever and elevated<br />

white cell count, and are in serious danger of<br />

osteomyelitis, septic arthritis, and severe joint<br />

damage. 86 Radiographic examination of the patients, in<br />

addition to looking for a chip fracture or foreign body,<br />

is directed at early signs of osteomyelitis or abscess<br />

formation within the bone. 92<br />

In the majority of cases, cultures yield S. aureus and<br />

Streptococcus viridans. 30,34 The other organisms<br />

commonly encountered are anaerobic Bacteroides<br />

species (found in 50% if specifically sought on culture)<br />

and E. corrodens. 28–30 E. corrodens is sensitive to penicillin.<br />

The clenched-fist wound to the metacarpophalangeal<br />

joint is a notoriously underestimated and<br />

undertreated injury. All patients with clenched-fist<br />

wounds should be managed with splinting, elevation,<br />

antibiotics, and surgical exploration. 93,94 In grossly<br />

septic joints, irrigation can be continued<br />

postoperatively for 48 to 72 hours. Early motion (48–72<br />

hours) should be advocated, 76 considering that stiffness<br />

is one of the more difficult complications to treat.<br />

Several studies 89–94 have shown that uncomplicated<br />

bite wounds (not involving the joint capsule or articular<br />

surface), when seen early (within 12 hours), can be<br />

adequately managed on an outpatient basis. Treatment<br />

involves wound exploration, vigorous irrigation,<br />

débridement, and supplementation with orally<br />

administered antibiotics, to be implemented only for<br />

reliable patients. The addition of appropriate<br />

intravenously or orally administered antibiotics is<br />

necessary to ensure eradication of the causative<br />

organism. Considering that the majority of infections are<br />

caused by staphylococci, streptococci, or E. corrodens, a<br />

reasonable first-line therapy is penicillin plus dicloxacillin<br />

10<br />

(penicillinase-resistant). 36 Cephalexin or erythromycin can<br />

be used in patients with allergy to penicillin.<br />

Animal Bite Wounds<br />

Domestic dogs are responsible for 90% of all animal<br />

bites. More than half the dog attacks involve young<br />

children, and of the resulting wounds, approximately<br />

half are to the hands and forearms. Dog bites become<br />

infected less often than do human or cat bites. A dog’s<br />

jaws can exert a force of 150 to 450 psi, which is<br />

sufficient to devitalize tissues. The resulting wound<br />

can be a puncture, laceration, avulsion, crush, or<br />

combination. 95,96 As with the human bite, the most<br />

common pathogens isolated are a mixture of aerobes<br />

(especially S. aureus and S. viridans), anaerobes<br />

(various Bacteroides species), and also P. multocida. 30–33<br />

Pasteurella infection should be suspected in cases of<br />

acute onset of cellulitis, lymphangitis, and<br />

serosanguineous or purulent discharge from a hand<br />

wound within 24 hours of a dog or cat bite.<br />

Fortunately, P. multocida is sensitive to penicillin.<br />

Unlike human bite wounds, which should not be<br />

closed primarily, most dog bite wounds 97,98 should be<br />

thoroughly irrigated with normal saline, have the<br />

margins sharply excised (especially over joints,<br />

tendons, vessels, and nerves), and have the edges<br />

loosely approximated with sutures. Most of the<br />

organisms commonly encountered in dog saliva are<br />

sensitive to penicillin, so a 5-day course of orally<br />

administered penicillin should be prescribed. 37 The<br />

tetanus status of the patient and the rabies status of the<br />

animal should be verified and treated as appropriate.<br />

Domestic cat bites account for only 5% of animal<br />

bite wounds to the hand. The configuration of the teeth<br />

of a cat is different from that of a dog. Cat teeth are long<br />

and sharp, and the injury subsequently inflicted tends<br />

to be a deep puncture wound. 99 Significantly less<br />

devitalization of tissues occurs with a cat bite compared<br />

with a dog bite, so commensurably less wound<br />

débridement is needed. The wound should be irrigated<br />

and loosely approximated if sufficiently large to<br />

warrant suturing. 100 An orally administered course of<br />

penicillin should be prescribed to cover Pasteurella.<br />

Cat bites can also give rise to cat-scratch fever, an<br />

infection caused by an intracellular gram-negative rod.<br />

The primary lesion is a small pustule or furuncle with


surrounding edema at the site of a cat scratch or bite.<br />

A similar lesion is seen at the regional lymph nodes.<br />

The course of the disease is benign and self-limiting,<br />

and treatment is symptomatic. The incubation period<br />

is 1 to 2 weeks, and symptoms last 1 to 3 weeks,<br />

although lymphadenopathy lasts 6 weeks and<br />

occasionally years.<br />

Atypical Mycobacterial Infections<br />

The incidence of tuberculosis of the hand has<br />

diminished at a rate commensurate with the decline in<br />

pulmonary tuberculosis. 20,101,102 In its place, however, are<br />

infections caused by atypical mycobacteria, which<br />

increase yearly. 103–105 The three major atypical<br />

mycobacteria involved in hand infection are<br />

Mycobacterium marinum, 106–109 Mycobacterium kansasii, 110–112<br />

and Mycobacterium terrae. 113–115<br />

M. marinum is the most common mycobacterial<br />

species to infect the hand. It lives in warm water<br />

environments and has been cultured from<br />

contaminated swimming pools, fish tanks, piers, boats,<br />

and stagnant water. It is endogenous to fresh and<br />

saltwater marine life. M. marinum survives best at<br />

31°C, and for that reason, it produces infections on the<br />

extremities rather than deep body cavities. 103–108<br />

Infections with M. marinum occur after a break in<br />

the integrity of the skin, often from an insignificant<br />

abrasion on the dorsum of the hand or over the<br />

interphalangeal or metacarpophalangeal joints of the<br />

fingers. Infection of the hand progresses through a<br />

spectrum of indolent skin ulcers through subcutaneous<br />

granulomas with sinus tracts, tenosynovitis (flexor and<br />

extensor), and septic arthritis or osteomyelitis. 116,117<br />

Treatment of superficial disease can be<br />

successful with chemotherapy alone, both<br />

minocycline and co-trimoxazole having been shown<br />

to be effective. 118,119 The largest study to date, from<br />

Hong Kong, suggests that chemotherapy alone<br />

might also be applicable to more extensive disease. 118<br />

Generally, deeper disease treatment also requires<br />

surgery with radical synovectomy and more specific<br />

antimycobacterial therapy with rifampicin and<br />

ethambutol for up to 2 years.<br />

Early clinical diagnosis of mycobacterial infections<br />

is made only with a high index of suspicion. When<br />

mycobacterial infection is suspected, cultures should<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

be performed at both 31 and 37°C; otherwise,<br />

M. marinum infections can be missed. Positive cultures<br />

for mycobacterial strains take at least 6 weeks for<br />

identification; therefore, treatment can be instituted on<br />

the basis of granulomas shown by histological<br />

examination or on the basis of acid-fast bacilli seen<br />

on a smear.<br />

Viral Infections<br />

Herpes Simplex Virus<br />

Herpes simplex virus (HSV) infection of the hand can be<br />

caused by a primary or recurrent infection with either<br />

HSV-1 or HSV-2. It tends to occur in three distinct<br />

patient subgroups. The first and largest group is<br />

adolescents with genital herpes, who tend to be infected<br />

with HSV-2. The remaining groups tend to be infected<br />

with HSV-1. The second group is children with oral<br />

gingivostomatitis, 120,121 and the third group is adult health<br />

care professionals—including dentists, anesthesiologists,<br />

surgeons, and nurses—who deal directly with<br />

potentially infected oral and respiratory secretions. 122<br />

Herpetic infection of the hand typically involves<br />

the fingers or thumb in the vast majority of cases. 123<br />

The infection initially declares itself with a prodromal<br />

phase of approximately 72 hours’ duration, with<br />

severe pain or tingling in the affected digit, and then<br />

erythema and swelling. This is called herpetic whitlow.<br />

During the ensuing hours to days, vesicles appear and<br />

coalesce, often around the eponychium and lateral nail<br />

fold. It is at that stage that the viral infection is most<br />

likely to be mistaken for a bacterial felon or<br />

paronychia. However, the pulp usually is not tense, as<br />

it would be in a case of bacterial felon. Associated<br />

lymphangitis can be present. The whole process takes<br />

approximately 2 weeks and then resolves in another 7<br />

to 10 days. Reactivation of latent virus occurs in only<br />

approximately 20% of hand patients. 124 It is not<br />

normally as severe as the primary infection and lasts<br />

for 7 to 10 days.<br />

It is possible to confirm the diagnosis by<br />

conducting laboratory investigations, including viral<br />

cultures. The Tzanck smear is relatively inexpensive<br />

and rapid. 125 Although not as sensitive as viral cultures,<br />

it is a useful adjunct in diagnosis, especially if<br />

performed early in the course of the disease, during<br />

the vesicular or pustular stages.<br />

11


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

The treatment of herpetic infections of the hand is<br />

primarily nonsurgical. Rest, elevation, and antiinflammatory<br />

analgesia are the mainstays of<br />

treatment. For immunocompromised patients,<br />

aggressive therapy with intravenously administered<br />

acyclovir might be warranted in an attempt to prevent<br />

a life-threatening viremia. 126,127<br />

Infections in Immunocompromised Patients<br />

Immunocompromised patients can develop hand<br />

infections from opportunistic organisms. The<br />

management of hand infections in<br />

immunocompromised patients is identical, irrespective<br />

of the underlying causes. Many of the fungi, viruses,<br />

and mycobacteria can be cultured only under very<br />

exacting laboratory conditions. Diagnosis almost<br />

certainly requires formal surgical tissue biopsy.<br />

Treatment is dictated by the organism cultured, but<br />

considering that many of the unusual organisms can<br />

take several weeks to grow, therapy must be instituted<br />

“on spec.” If a fungal origin is most likely,<br />

intravenously administered amphotericin B is the first<br />

line treatment. Similarly, for a viral origin, of which<br />

herpes simplex is the most likely, acyclovir is<br />

intravenously administered. Finally, if a mycobacterial<br />

species is suspected, triple-agent therapy (rifampicin,<br />

ethambutol, isoniazid) is instituted.<br />

Diabetes Mellitus<br />

C. albicans infections of the nails are common in<br />

diabetics, so much so that a random blood glucose<br />

level should be obtained as a baseline for any patient<br />

presenting with an infection of the nail complex. The<br />

same has been suggested by some groups for a first<br />

presentation with flexor tenosynovitis. 128 Infections can<br />

commence from relatively simple injuries (e.g., felons<br />

and suppurative flexor tenosynovitis occurring after<br />

fingerstick blood test for glucose levels). 63,129<br />

Microbiology often shows a mixed flora, and S. aureus,<br />

so commonly encountered in “normal” patients with<br />

suppurative hand infections, often is grossly<br />

outweighed by gram-negative organisms. 130 Diabetics<br />

often present with advanced disease (bone, tendon, or<br />

deep space infection), which can also reflect a<br />

peripheral neuropathy as a causative factor. 130–133<br />

Finally, many undergo amputation, either to control<br />

12<br />

infection or because the function in the remaining part<br />

is so poor as to be a hindrance or danger to the patient.<br />

Treatment of hand infections in diabetics must be<br />

early and aggressive if useful function is to be<br />

maintained and amputation avoided. 130–133 Obvious<br />

abscesses must be drained and appropriate specimens<br />

obtained for aerobic and anaerobic cultures.<br />

Radiographs should be obtained and supplemented<br />

with bone scans, if indicated. Broad-spectrum<br />

intravenous antibiotic cover should be instituted and<br />

appropriately modified after cultures are returned.<br />

Rehabilitation should be aggressive and instituted as<br />

soon as the acute manifestations of the infection are on<br />

the wane.<br />

TUMORS<br />

Several authors offer excellent reviews of the spectrum<br />

of hand neoplasms, including their incidence, causes,<br />

anatomic distribution, and management, which almost<br />

always involves surgical remova1. 134–140 Only the more<br />

common hand tumors are discussed herein. The<br />

overwhelming majority of hand masses are benign,<br />

and true neoplasms are rare in the hand (Table 2).<br />

Soft-Tissue Tumors<br />

Ganglia<br />

Ganglia are the most common benign tumors in the<br />

hand. 141–143 Although trauma is commonly thought to be<br />

implicated in the development of ganglia, a traumatic<br />

antecedent has been documented in only a small<br />

percentage of patients. The pathogenesis is thought to<br />

be mucoid degeneration of fibrous connective tissue in<br />

joint capsules or tendon sheaths occurring<br />

idiopathically or secondary to injury or irritation.<br />

Ganglia are two to three times more common in<br />

women than in men. The usual clinical presentation is<br />

that of a mass with or without pain. Occasionally,<br />

occult ganglia present as paresthesias or weakness<br />

from nerve compression. 144–147 Ganglia sometimes even<br />

arise within tendon 148 or bone. 149<br />

Dorsal wrist ganglia—The dorsum of the wrist<br />

accounts for 70% of all ganglia in the hand and wrist.<br />

In the dorsum of the wrist, the ganglion usually<br />

overlies the scapholunate ligament. Clay and Clement 150<br />

noted the pedicle of the ganglion to arise from that site<br />

in 76% of patients. The cause of dorsal wrist ganglia is


Bone<br />

Soft Tissue<br />

still uncertain, but some evidence indicates underlying<br />

peri-scaphoid ligamentous instability. 151<br />

Volar wrist ganglia—Volar wrist ganglia arise from<br />

the flexor carpi radialis tendon sheath or the<br />

radioscaphoid, scapholunate, or scaphoid-trapeziumtrapezoid<br />

joint. Ultrasonography can delineate the<br />

origin preoperatively. The ganglion is in close proximity<br />

to the radial artery, which can cause it to be bilocular.<br />

Flexor tendon sheath ganglia—Flexor tendon sheath<br />

ganglia arise from the volar flexor tendon sheaths in the<br />

vicinity of the metacarpophalangeal joint. They often<br />

present through the A1 or A2 pulleys or in the interval<br />

between them. Flexor tendon sheath ganglia are thought<br />

to be a direct result of pressure damage to the fibrous<br />

sheath and require excision only if symptomatic, taking<br />

a small cuff of pulley as required. 152<br />

Mucous cysts—Ganglia arising in association with<br />

tendons and joints on the dorsal aspect of fingers can<br />

originate from the extensor tendon itself or, more<br />

commonly, from the joint capsule. 153–155 They occur<br />

primarily in older women who have osteoarthritic<br />

changes of the underlying joint, usually the distal<br />

interphalangeal joint. When an underlying arthritic<br />

joint is the cause of the ganglion, the joint must<br />

undergo débridement or the ganglion will recur.<br />

Mucous cysts can produce a deformity of the nail plate<br />

Table 2<br />

Grading of Bone and Soft-tissue Tumors of the Hand134 <strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

Benign (G0) Low-grade Sarcomas (G1) High-grade Sarcomas (G2)<br />

Enchondroma<br />

Osteochondroma<br />

Fibrous dysplasia<br />

Osteoid osteoma<br />

Bone cysts<br />

Hemangioma<br />

Osteoblastoma<br />

Ganglion<br />

Giant cell tumor<br />

(tendon sheath)<br />

Lipoma<br />

Neurolemmoma<br />

Chondromatosis<br />

Glomus tumor<br />

Giant-cell tumor<br />

Desmoplastic fi broma<br />

Chondrosarcoma (low-grade)<br />

Parosteal osteosarcoma<br />

Desmoid<br />

Liposarcoma (low-grade)<br />

Fibrosarcoma (low-grade)<br />

Kaposi’s sarcoma<br />

Osteosarcoma<br />

Ewing’s sarcoma<br />

Lymphoma<br />

Chondrosarcoma<br />

Angiosarcoma<br />

Myeloma<br />

Synovioma<br />

Malignant fi brous histiocytoma<br />

Liposarcoma (high-grade)<br />

Rhabdomyosarcoma<br />

Epithelioid sarcoma<br />

Clear cell sarcoma<br />

Angiosarcoma<br />

Hemangiopericytoma<br />

Malignant schwannoma<br />

from pressure on the nail bed. Brown et al. 156 reported<br />

their experience with 26 nail deformities secondary to<br />

mucous cysts of the distal interphalangeal joint<br />

managed by excision of the cyst and débridement of<br />

associated osteophytes. No recurrences occurred<br />

during the follow-up period, and residual nail<br />

deformity in eight patients was negligible.<br />

Pathologic anatomy—A ganglion typically has a<br />

uni- or multilocular main cyst that communicates with<br />

smaller intra-articular cysts through a tortuous,<br />

continuous, one-way valvular system of ducts. 140<br />

Microscopic examination of the ganglion wall typically<br />

reveals compressed collagen fibers with no evidence of<br />

cells of epithelial or synovial origin. 157,158 The cyst<br />

contains viscous mucoid material consisting of<br />

glucosamine, albumin, globulin, and hyaluronic acid.<br />

Management—Rosson and Walker 159 reviewed the<br />

natural history of ganglia in children and noted that<br />

22 of 29 lesions resolved spontaneously. A<br />

conservative approach to ganglia is therefore<br />

advocated for young patients. 159,160 The management of<br />

wrist ganglia in adults is controversial. The literature<br />

supports a spontaneous regression rate of 38% to<br />

58%, 161 whereas treatment of all types is associated<br />

with recurrence rates from less than 1% 143 to 50% 162<br />

(average 24%). Incomplete excision of the cyst stalk<br />

13


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

complex probably accounts for the high recurrence<br />

rate. 163 Prevention of recurrence depends on<br />

identification and excision of the involved segment of<br />

joint capsule and deep attachments of the cyst pedicle<br />

to the scapholunate ligament but only minimal<br />

resection of the ligament itself to prevent future<br />

scapholunate dissociation (Fig. 10). 164 Clay and<br />

Clement 150 noted only 3.2% recurrence when using<br />

that protocol. More radical procedures pose a greater<br />

risk of subsequent stiffness, hypertrophic scar, wound<br />

infection, and nerve damage.<br />

Figure 10. Ganglion with pedicle attached to scapholunate<br />

ligament. (Reprinted with permission from Minotti and Taras. 164 )<br />

Filan and Herbert 165 think that symptomatic dorsal<br />

wrist ganglia are the result of scaphoid instability that,<br />

if present at the preoperative clinical examination, is<br />

treated by a dorsal capsulorrhaphy of the wrist<br />

combined with ganglion excision. Of seven patients<br />

who underwent surgery for recurrent ganglia in whom<br />

capsulorrhaphy was performed, none had experienced<br />

recurrence of ganglia at 12 months.<br />

The treatment of wrist ganglia is indicated only in<br />

the event of significant discomfort or deformity.<br />

Although surgery is the mainstay of treatment,<br />

various nonoperative techniques have been<br />

advocated. Aspiration 166,167 or injection of enzymes, 168<br />

sclerosing agents, or cortisone have been suggested,<br />

but all are associated with a significant recurrence<br />

rate. Arthroscopic resection of the ganglion might be<br />

associated with a lower recurrence rate. 169–171 It can also<br />

14<br />

identify the exact origin of the ganglion and other<br />

intra-articular pathological conditions.<br />

Giant Cell Tumors of Tendon Sheath<br />

Giant cell tumors are the second most frequent type of<br />

hand tumor. They typically occur in the fingers of 20to<br />

40-year-old patients and are slightly more common<br />

in women. Giant cell tumors of the tendon sheath are<br />

also known as pigmented villonodular synovitis when<br />

they arise from the volar joint recess. 172,173 No evidence<br />

has shown that repeated hemorrhage, friction, or<br />

cholesterol imbalance contributes significantly to the<br />

development of giant cell tumors, and only<br />

approximately one-third of patients provide histories<br />

of previous trauma or surgery to the region. Pain and<br />

tenderness are not prominent features, but prolonged<br />

unchecked tumor growth interferes with mechanical<br />

function of the hand.<br />

The clinical presentation of a giant cell tumor of<br />

the tendon sheath is that of a lobulated, mottled,<br />

yellow subcutaneous mass. Although the diagnosis<br />

usually is evident clinically, magnetic resonance<br />

imaging (MRI) has been described as an adjunct in the<br />

preoperative assessment of extensive tumors. 174 The<br />

characteristic lobulation is seen microscopically, and a<br />

relatively noncellular, collagenous connective tissue<br />

often divides and partially envelops the lesion. 175<br />

Histological examination reveals the basic polyhedral<br />

cells of a fibrous xanthoma. In the more cellular areas,<br />

mitotic figures are seen, but never in large numbers.<br />

Also present are spindle cells, multinucleated giant<br />

cells, foam cells, and reticulin. 175,176 The tumor can erode<br />

bone by pressure 177 and/or infiltrate the overlying<br />

dermis. 178 Frank bony invasion has been documented. 179<br />

Treatment is complete local excision, ensuring<br />

total clearance of the volar joint recess. Recurrences<br />

unfortunately are common, especially in the fingers,<br />

and are the result of inadequate resection, for which<br />

repeat excision is recommended. 180 Extensive<br />

recurrences often necessitate arthrodesis of the<br />

affected joint in that resection of violated ligaments<br />

and joint capsule might be required. Very occasionally,<br />

amputation is necessary. Despite infiltrative growth<br />

patterns, rapid recurrence, and a frequently confusing<br />

histological appearance, giant cell tumors are<br />

considered benign. 181


Vascular Lesions<br />

Several authors offer excellent reviews of vascular<br />

tumors of the hand and upper extremity. 182–186 Upton<br />

and Coombs 187 discussed pediatric vascular tumors.<br />

Glomus tumors—Glomus tumors are benign<br />

hamartomas of the normal glomus apparatus, which<br />

consists of arteriovenous anastomoses involved in the<br />

regulation of cutaneous circulation. 188–191 Glomus tumors<br />

usually are smaller than 1 cm in diameter (often<br />

measuring only a few millimeters) and classically<br />

present with the triad of pain, pinpoint tenderness, and<br />

cold sensitivity. Transillumination is a simple and useful<br />

clinical test. 192 The most common site of presentation is<br />

subungual, but glomus tumors occasionally occur on the<br />

volar surface of a digit. Approximately one-fourth of all<br />

glomus tumors are multiple. 193,194 Ultrasonography 195–197<br />

and MRI 198–200 are used as aids in diagnosis and also to<br />

detect multiple tumors.<br />

Treatment is by excision. If subungual, care should<br />

be taken to repair the nail bed after removal of the<br />

tumor. The major problems after surgical treatment are<br />

a high recurrence rate and a residual nail deformity. 201–203<br />

Ulnar artery aneurysms—Ulnar artery aneurysms<br />

are almost always posttraumatic (“hypothenar hammer<br />

syndrome” 204,205 ) and occur predominantly in male<br />

patients. 206,207 Typical clinical features are a pulsatile<br />

mass accompanied by digital ischemic changes, with or<br />

without distal emboli. 208,209 An ulnar nerve Tinel sign<br />

often is present. 210 An Allen’s test should be performed<br />

to ascertain patency of the ulnar artery, and<br />

arteriography can rule out thrombosis of the ulnar<br />

artery and embolic showering. Management consists of<br />

aneurysm resection and ligation of the ulnar artery,<br />

with autogenous vein grafting in cases of inadequate<br />

collateral circulation. 211,212 Regional thrombolysis can<br />

also be considered in cases with embolization. 209<br />

Peripheral Nerve Tumors<br />

True neural cell tumors in the hand are rare (1%–5%<br />

incidence). 213 All lesions arise from Schwann cells. 214–216<br />

Although no uniform classification of peripheral nerve<br />

tumors exists, most clinicians refer to five general types.<br />

Neurilemmomas—Neurilemmomas are the most<br />

common solitary tumors of neural cell origin in the<br />

hand and are particularly prevalent in middle-aged<br />

patients. 217,218 Neurilemmomas begin as asymptomatic<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

nodular swellings without associated sensory or motor<br />

abnormalities. When exposed surgically, they are seen to<br />

have a dumbbell shape and to lie extrinsic to the nerve<br />

fiber proper. Histologically, they are made up almost<br />

exclusively of Schwann cells. Excision involves<br />

enucleation under magnification so as to preserve nerve<br />

fibers that fan out over the tumor. Recurrences are rare,<br />

and malignant degeneration is not a clinical feature.<br />

Neurofibromas—Unlike neurilemmomas,<br />

neurofibromas can intimately proliferate within nerve<br />

fibers, producing functional abnormalities and making<br />

excision more difficult without division of the nerve.<br />

Histologically, neurofibromas are difficult to differentiate<br />

from neurilemmomas, although they exhibit mast cells,<br />

lymphocytes, mucoid material, and xanthoma cells in<br />

addition to Schwann cells. 218 Solitary lesions usually<br />

occur before age 10 years. Neurofibromas can cause<br />

gigantism of the affected part. 219,220<br />

Neurofibromatosis—Neurofibromatosis (von<br />

Recklinghausen disease) is an autosomal dominant<br />

condition characterized by multiple peripheral and<br />

central neurofibromata (acoustic neuromas,<br />

meningiomas, optic gliomas). Temporal lobe<br />

involvement can erode the greater wing of the<br />

sphenoid, producing pulsatile exophthalmos. 220<br />

Extremity involvement can produce gigantism of the<br />

limb. 221 Diagnostic café au lait spots, numbering more<br />

than six, occur on the skin. The individual tumors<br />

manifest a plexiform pattern. Sarcomatous degeneration<br />

has been reported in 2% to 3% of lesions. 222<br />

Neurofibrosarcomas—Neurofibrosarcomas<br />

(neurosarcomas or malignant schwannomas) account<br />

for 2% to 3% of malignant hand tumors and usually<br />

are associated with von Recklinghausen disease. 223<br />

Local extension and metastases are common, resulting<br />

in 90% mortality. Wide excision or amputation of the<br />

extremity is the recommended treatment.<br />

Intraneural tumors of non-neural origin—<br />

Intraneural tumors of non-neural origin include<br />

lipofibromatous hamartomas, hemangiomas, ganglion<br />

cysts, and lipomas. 224 Lipofibromatous hamartomas<br />

commonly occur within the 1st decade of life and<br />

usually involve the median nerve. They can result in<br />

macrodactyly, especially of the index and middle<br />

fingers. 225 Treatment involves release of the carpal<br />

tunnel after excision of the tumor under magnification.<br />

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<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

Malignant degeneration has not been reported.<br />

Epidermal Inclusion Cysts<br />

Epidermal inclusion cysts commonly occur on the<br />

palmar surface of the hand or digits of patients whose<br />

work or leisure activities predispose them to<br />

penetrating hand injuries. The time from the traumatic<br />

incident to cyst development varies from months to<br />

years. Clinically, the lesions are firm, spherical, and<br />

nontender. The cyst wall consists of squamous<br />

epithelium with laminated keratin, and the cyst material<br />

contains protein, cholesterol, fat, and fatty acids.<br />

Spontaneous rupture is common, but the lesion<br />

often persists unless the cyst lining, contents, and<br />

overlying puckered skin are surgically removed. Local<br />

complications include infections and bone erosion.<br />

Malignant Skin Tumors<br />

Malignant tumors of the skin of the hand make up a<br />

very small percentage of upper extremity neoplasms226- 228 and are primarily squamous cell carcinomas<br />

(SCC). 229–232 SCC predominate among people with fair<br />

skin and light hair color. The usual origin of SCC is<br />

ionizing solar radiation. Other less common causes of<br />

SCC are previous irradiation, 233 burn scars, exposure to<br />

arsenic compounds, and inherited genetic disorders. 234<br />

The dorsum of the hand, with the highest actinic<br />

exposure, is the most common site for SCC, although<br />

the tumor has been reported to also occur on the<br />

palms235 and subungually. 236–239 Appropriate treatment<br />

consists of a 4-mm margin for tumors with a diameter<br />

of less than 2 cm. When the size of the tumor exceeds<br />

those dimensions, a margin of 6 mm is necessary. 240 If<br />

evidence exists of nodal metastasis or local recurrence,<br />

axillary lymphadenectomy is recommended. The role<br />

of sentinel node biopsy in cases of SCC is not yet<br />

defined in the literature. SCC of the hand is an<br />

aggressive tumor prone to recurrence and metastasis.<br />

The metastatic rate for SCC of the hand is higher than<br />

elsewhere on the body, particularly if the primary<br />

lesion involves the digital web space. 230<br />

Basil cell carcinomas—Basal cell carcinomas (BCC)<br />

are very uncommon tumors on the finger. 241 Palmar<br />

variants have been observed, 242 especially in cases of<br />

Gorlin’s syndrome (multiple nevoid BCC syndrome), 243<br />

and BCC has been reported to also occur<br />

16<br />

subungually, 244 in which case differentiation from a<br />

subungual melanoma must be made. 245 Although BCC<br />

do not metastasize, they are locally aggressive.<br />

Excision is the usual form of treatment.<br />

Melanomas—Melanomas of the hand can occur on<br />

the palm 246–255 or subungually. 256–259 A study by Ridgeway<br />

et al. 255 showed that the acral histological subtype does<br />

not affect the disease-free and overall survival. Tumor<br />

thickness remains the only prognostic indicator.<br />

Slingluff et al. 252 found that acral melanoma has a<br />

strong racial predilection, carries a grave prognosis,<br />

and arises from glabrous skin. In that study, no<br />

survival difference was shown between volar and<br />

subungual sites, nor did amputation make a difference.<br />

Melanoma requires wide excision or amputation of the<br />

digit or hand, depending on location and depth. 260–262<br />

The appropriate level of amputation has not been<br />

determined. Papachristou and Fortner 256 advocated<br />

amputation through the carpometacarpal joint,<br />

whereas Finley et al. 258 performed seven finger<br />

amputations distal to the metacarpophalangeal joint<br />

(four just proximal to the distal interphalangeal joint<br />

and three just proximal to the proximal interphalangeal<br />

joint), with no local recurrences. Quinn et al. 259 showed<br />

no difference in local recurrence for subungual<br />

melanomas whether amputations are performed<br />

proximal or distal to the interphalangeal joint of the<br />

thumb or the middle of the middle phalanx in the<br />

fingers. Similarly, no prospective study to date has<br />

shown a survival or local control benefit to prophylactic<br />

lymph node dissection, regional perfusion, or<br />

immunotherapy. 263–265 The use of sentinel lymph node<br />

biopsy has grown significantly in recent years. 266,267<br />

Bony Tumors<br />

Several authors have presented excellent reviews of<br />

bony tumors of the hand. 268–270 Treatment is based on<br />

accurate diagnosis and staging of the lesions (Table 3).<br />

Chondromas<br />

Chondromas are the most common benign<br />

cartilaginous tumors of the hand. 271,272 Chondromas that<br />

remain within the substance of the bone or cartilage<br />

are called enchondromas. 273–275 Enchondromas favor the<br />

tubular bones of the hand, especially the middle and<br />

proximal phalanges. Congenital cartilaginous rests are


implicated in their origin, and the lesions are totally<br />

benign, with little tendency toward malignant<br />

degeneration. Nelson et al. 276 reviewed the literature<br />

and found only three well-documented cases of<br />

chondrosarcoma arising from enchondromas.<br />

Enchondromas usually appear as well-demarcated<br />

round or oval swellings. A pathological fracture often<br />

is the first indication of their presence. In such cases,<br />

the fracture should be allowed to heal before the<br />

enchondroma is treated. Radiographically,<br />

enchondromas appear as radiolucent, symmetric,<br />

fusiform, expansile diametaphyseal lesions that do not<br />

involve the epiphyses. Treatment usually consists of<br />

curettage of the tumor through a window in the cortex,<br />

with or without cancellous bone grafting. 277,278<br />

Hasselgren et al. 279 questioned the need for bone<br />

grafting and reported excellent bone healing with<br />

curettage alone. They think that bone grafting should<br />

be reserved for the rare circumstance in which “the<br />

tumor has so severely damaged the bone stock that the<br />

bone is likely to collapse during surgery”. 279<br />

Multiple enchondromas—Multiple enchondromas<br />

are rare in the hand and always occur as part of a<br />

disseminated involvement (Ollier dyschondroplasia). 280<br />

Multiple enchondromas associated with hemangiomas<br />

are part of Maffucci syndrome. The earliest clinical<br />

manifestations of multiple enchondromatosis are<br />

swelling and deformity of several bones. 281 The tumors<br />

distort, expand, and sometimes erode the bony cortex,<br />

particularly in the diaphyses and metaphyses;<br />

calcifications are seen in the translucent areas on<br />

radiographs. Because 20% of multiple enchondromas<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

Table 3<br />

Enneking Staging System for Bone and Soft-tissue Tumors and Their Indicated Excision134 Stage Grade (G) Anatomic Location (T) Metastases (M)<br />

0 Benign (G0) Any (T1 or T2) None (M0)<br />

IA Low (G1) Intracompartmental (T1) None (M0)<br />

IB Low (G1) Extracompartmental (T2) None (M0)<br />

IIA High (G2) Intracompartmental (T1) None (M0)<br />

IIB High (G2) Extracompartmental (T2) None (M0)<br />

III Any grade Any (T1 or T2) Metastasis (M1)<br />

go on to become chondrosarcomas, wide excision is<br />

the treatment of choice, with adjuvant radiotherapy to<br />

the malignant lesions.<br />

Osteochondromas—Osteochondromas are the most<br />

common cartilaginous neoplasm in the body overall but<br />

are less common than enchondromas in the hand. 282,283 Like<br />

enchondromas, osteochondromas arise from congenital<br />

cartilaginous foci, which qualify them as manifestations of<br />

congenital dysplasia. A very slight risk (1%) of malignant<br />

transformation is associated with osteochondromas.<br />

Radiographically, osteochondromas appear as bony<br />

protuberances extending beyond the metaphyseal cortex<br />

of the involved bone on a narrow stalk.<br />

Exostoses<br />

Exostoses usually require no treatment. Subungual<br />

lesions typically have a traumatic antecedent and are<br />

characterized by pain on pressure to the nail plate<br />

months after the injury. 284,285 Radiography readily<br />

differentiates exostosis from other entities. If required,<br />

the deformed nail can be removed and the mass<br />

excised from the distal phalanx.<br />

Bone Cysts<br />

Aneurysmal bone cysts tend to show an equal sex<br />

distribution and are more common during the 2nd<br />

decade of life but before closure of the epiphyseal<br />

plate. Aneurysmal bone cysts are eccentrically placed<br />

in the metaphysis or diaphysis, are expansile and<br />

lucent, and resemble a periosteal blowout. 286,287 Surgical<br />

resection or curettage with bone grafting usually is<br />

curative unless the cyst has been incompletely excised.<br />

17


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

Osteoid Osteomas<br />

Osteoid osteomas are benign osteoblastic tumors that<br />

are uncommon in the hand. 288 The lesion affects male<br />

patients two to three times more often than female<br />

patients, generally between the ages of 10 and 25<br />

years. Osteoid osteoma occurs most frequently in the<br />

distal phalanges. 289,290 The cause is unknown.<br />

The nidus of an osteoid osteoma consists of richly<br />

vascularized osteoblastic osteoid tissue rarely larger<br />

than 1 cm. Clinical presentation is that of a localized,<br />

painful area over a tubular bone. Typically, the pain is<br />

worse at night and is completely relieved by aspirin.<br />

An increase in the size of the terminal digit might<br />

occur. Radiographically, the lesion shows a central area<br />

of lucency that can be surrounded by a zone of<br />

sclerotic bone. Bone scintigraphy with technetium 99m<br />

is of benefit in locating the nidus, and Cp80 has also<br />

been used. Treatment involves complete excision of the<br />

lesion and packing of the cavity with cancellous bone.<br />

Osteoblastomas<br />

Like osteoid osteomas, osteoblastomas are rare in the<br />

hand, favor the tubular bones, and occur primarily in<br />

young patients. Unlike osteoid osteomas, osteoblastomas<br />

exhibit no sex predilection and usually are larger than<br />

1.5 to 2 cm. Because of the bone destruction<br />

accompanying osteoblastomas, the differential diagnosis<br />

includes osteoid osteoma, aneurysmal bone cyst, and<br />

malignant tumors. The entire bone must be removed for<br />

cure. Radiotherapy is helpful in tumor cell control and<br />

might even aid in healing.<br />

Giant Cell Tumors of Bone<br />

Giant cell tumors are uncommon anywhere. They<br />

represent approximately 5% or less of all primary<br />

malignant bone tumors, and only 2% to 5% of giant<br />

cell tumors occur in the hand. 291 The lesion affects<br />

patients primarily between the ages of 30 and 50 years<br />

and is virtually unknown in patients younger than 20<br />

years. Women with giant cell tumors slightly<br />

outnumber men.<br />

Clinically, the giant cell tumor is a solitary lesion,<br />

often well advanced by the time it is noticed. A dull,<br />

constant pain heralds its presence, sometimes preceded<br />

by swelling. 292,293 Radiographically, it is seen to involve<br />

the soft tissues. The epiphyseal end of the bone is<br />

18<br />

affected, with extension to the adjacent metaphysis. The<br />

tumor is translucent, and the cortex of the bone is<br />

noticeably thin. The clinical course is long but localized.<br />

Sarcomatous degeneration averages 10%, and the lesion<br />

metastasizes in approximately 15% of cases. 294–297<br />

Treatment consists of wide resection with autograft<br />

or allograft replacement. 298–300 The recurrence rate is<br />

high (75%). Amputation is reserved for recurrent or<br />

highly malignant tumors.<br />

Sarcomas<br />

Sarcomas are very uncommon tumors in the hand. The<br />

pathological subtypes of soft-tissue sarcomas 301–303 and<br />

malignant primary bone tumors 304,305 have been<br />

reviewed by several authors. Treatment protocols for<br />

both bony and soft-tissue extremity sarcomas have<br />

been reviewed. 306–314 Combination therapy (wide<br />

excision, radiotherapy, and chemotherapy) is now used<br />

for most high-grade tumors and produces excellent<br />

local control rates in some tumor types. Amputation is<br />

avoided and is saved for the management of local<br />

recurrences. When sarcomas fail, they tend to do so at<br />

distant sites. In that circumstance, a functional hand<br />

provides a better quality of life.<br />

Skeletal Sarcomas<br />

Ewing sarcomas—Ewing sarcomas account for<br />

approximately 6% to 10% of primary malignant<br />

tumors of bone and are rare in the hand. 315–317 They<br />

affects male patients twice as often as female patients,<br />

and they affect a younger age group than any other<br />

bone tumor. A focal mass is a frequent clinical finding,<br />

and radiographically, the lesion shows permeation,<br />

soft-tissue mass, and often a sclerotic reaction. 318<br />

Angiography, computed tomography (CT), and MRI<br />

often are used in treatment planning. 319 Ewing sarcoma<br />

generally has a poor prognosis, although the subset of<br />

patients with Ewing sarcoma of the hand can expect<br />

excellent local control and good function with<br />

combination therapy. 308,314<br />

Osteosarcomas—Osteosarcomas in the hand are<br />

rare tumors, accounting for only 0.18% of all<br />

osteosarcomas. 320 Peak incidence is during the 2nd<br />

decade of life, with a male-to-female ratio of 2:1. The<br />

presenting complaint is persistent, increasing pain<br />

from a rapidly growing mass. 321,322 The pathogenesis is


unknown. The lesions might arise de novo or might<br />

occur secondary to a benign process. Osteosarcomas in<br />

general tend to occur more frequently in association<br />

with irradiated bone, Paget’s disease, fibrous dysplasia<br />

of bone, giant cell tumor, solitary enchondroma,<br />

multiple enchondromatosis, and multiple<br />

osteochondromas.<br />

Radiographically, the borders of an osteosarcoma<br />

are indistinct, but the lesion invariably involves the<br />

cortex and generally transgresses it. Often, a large<br />

contiguous soft-tissue mass is present. A combination<br />

of destructive and proliferative new bone usually is<br />

present, showing a streaked texture and a<br />

characteristic sunburst pattern. Histologically,<br />

osteosarcoma has a typical spindle-shaped cell pattern.<br />

Treatment has changed from amputation to excision<br />

with a wide margin plus adjuvant therapy. In a study<br />

presented by Okada et al., 320 local control was achieved<br />

in five of six patients by using this protocol; one<br />

patient died as a result of metastatic disease.<br />

Chondrosarcomas—Chondrosarcomas are<br />

uncommon in the hand, where they occasionally are<br />

associated with osteochondromas and, to a lesser<br />

degree, with multiple enchondromatosis, 323,324 although<br />

the vast majority of cases include no preexisting<br />

lesion. 325,326 Chondrosarcomas characteristically occur in<br />

older patients (60–80 years) in the epiphyseal area of<br />

the proximal phalanx or metacarpal. The clinical<br />

course is slow, and metastasis is late. 327,328 The tumor<br />

presents as a progressively painful large mass near the<br />

metacarpophalangeal joint. Treatment of choice is<br />

amputation or ray resection. Histological interpretation<br />

of cartilaginous lesions of the hand is difficult, and<br />

clinical and radiological appearance (bone expansion,<br />

lytic areas of bone destruction, soft-tissue swelling)<br />

often are more reliable indicators of malignancy.<br />

Prognosis is good if metastasis has not occurred. 325,326<br />

Soft-Tissue Sarcomas<br />

Rosenberg and Schiller 302 have provided an excellent<br />

review of soft-tissue sarcomas of the hand. Soft-tissue<br />

sarcomas are an uncommon but important group of<br />

hand tumors. They tend to occur in young patients, are<br />

innocuous in presentation, often leading to an incorrect<br />

diagnosis, and have protracted clinical courses. They<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

are prone to local recurrence, have an unusually high<br />

incidence of lymphatic spread and regional node<br />

metastases, and often metastasize systemically late in<br />

their course. Deep tumors that are firm and are 5 cm or<br />

larger should be considered to be possible sarcomas<br />

until proven otherwise. 313 CT and MRI often are used<br />

to define the anatomy. Standard treatment is wide<br />

surgical excision with or without adjunctive<br />

radiotherapy and/or chemotherapy. The prognosis<br />

generally is poor.<br />

Epithelioid sarcomas—Epithelioid sarcomas are the<br />

most common soft-tissue sarcomas of the hand. 329 A<br />

posttraumatic origin has been proposed by some. 330<br />

Lesions are notoriously insidious and often mistaken<br />

for a benign inflammatory condition. 331 Most lesions in<br />

the hand arise on the palm or volar surface of the<br />

digits. 332,333 Local recurrence is common, as is distant<br />

metastasis. Treatment recommendations are radical<br />

excision (often necessitating a partial amputation 313 ) and<br />

node dissection. 334 Adjuvant therapy can be of benefit.<br />

Malignant fibrous histiocytomas—Malignant<br />

fibrous histiocytomas are among the more common<br />

soft-tissue sarcomas in the adult upper extremity. 313<br />

Lesions can be superficial or deep, single or<br />

multinodular. They extend along tissue planes and<br />

metastasize via the lymphatics and bloodstream. 335<br />

Treatment primarily is surgical, with radiotherapy<br />

added unless there has been a generous margin. The<br />

value of chemotherapy has yet to be defined.<br />

Alveolar rhabdomyosarcomas—Alveolar<br />

rhabdomyosarcomas tend to involve the thenar and<br />

hypothenar musculature. 336,337 An alveolar<br />

rhabdomyosarcoma is a highly malignant, devastating<br />

tumor that presents as a rapidly growing, deep mass in<br />

the palm of a child. 313 Local recurrence is common, and<br />

it is invariably fatal if not adequately treated. The<br />

incidence of nodal spread and distant metastases is<br />

high. The prognosis for alveolar rhabdomyosarcoma has<br />

improved with multi-modality therapy but is still poor.<br />

Synovial sarcomas—Synovial sarcomas arise in the<br />

juxta-articular soft tissues (tendon, tendon sheath, and<br />

bursa). 338 A synovial sarcoma presents as a slowgrowing<br />

tumor on the volar surface of the hand, and<br />

delay to presentation often is measured in years.<br />

Synovial sarcoma has a poor prognosis and a high<br />

19


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

incidence of metastases. Treatment usually consists of<br />

surgery (often involving a partial amputation 313 ),<br />

radiotherapy, and chemotherapy.<br />

Fibrosarcomas—Fibrosarcomas arise within the<br />

deep subcutaneous space, fascial septa, or muscle and<br />

present as insidiously growing deep masses. 339,340<br />

Lymph node metastases are less common with<br />

fibrosarcoma, but hematogenous spread frequently<br />

occurs. Treatment is wide excision or amputation when<br />

neurovascular structures are compromised. 341 Adjuvant<br />

therapy can be of benefit.<br />

Clear cell sarcomas—Clear cell sarcomas<br />

(malignant melanomas of soft parts) are uncommon<br />

tumors. A clear cell sarcoma presents as a slowgrowing,<br />

deep-seated mass attached to tendons,<br />

aponeuroses, or fascia. 342,343 Prognosis is poor, with a<br />

very high rate of local recurrence and both lymphatic<br />

and hematogenous dissemination. <strong>Surgery</strong> with node<br />

dissection usually is combined with radiotherapy<br />

and chemotherapy.<br />

Kaposi sarcomas—Kaposi sarcomas are<br />

malignant tumors that often involve bone and can<br />

originate in bone. The hand and foot are the most<br />

common locations of occurrence and early<br />

detection. 344 Patients of all ages can be affected, from<br />

very small children to the elderly, with peaks in the<br />

4th and 5th decades. The male-to-female ratio is 10:1,<br />

and Kaposi sarcoma is strongly associated with<br />

acquired immunodeficiency syndrome. 345<br />

The first clinical signs are dark blue to violaceous<br />

macules on the skin that are later replaced by<br />

infiltrative plaques and finally by nodules measuring<br />

0.5 to 3 cm in diameter. Some of the lesions heal, and<br />

others coalesce and ulcerate. Initially, the skin lesions<br />

correspond to the distal end of the tumor in the bone,<br />

but in time, the skin manifestations appear at<br />

progressively more proximal levels. Radiographic<br />

examination reveals the affected bones to be<br />

decalcified in a trabecular pattern, with cortical<br />

thinning as the tumor expands. Cystic erosion shows<br />

as bites taken out of the bone.<br />

Treatment is by a combination of radiotherapy<br />

and chemotherapy. The prognosis varies according to<br />

the behavior of the tumor. Fulminating lesions have a<br />

fatal outcome within 6 to 12 months of diagnosis,<br />

20<br />

whereas slower growing tumors are compatible with<br />

20-year survival.<br />

Metastatic Tumors<br />

Hand metastases are very uncommon and usually are<br />

associated with a primary carcinoma in the lung 346–348 or<br />

kidney. Despite their rarity, metastatic tumors should be<br />

considered in the differential diagnosis of inflammatory<br />

processes of the hand. The distal phalanges are most<br />

often involved, and metastases in those locations often<br />

are mistaken for felons or paronychia. 349–351<br />

Amadio and Lombardi 352 recommend palliative<br />

treatment considering the median survival time of only<br />

5 months. Amputation of a phalanx, digit, or ray is<br />

recommended for most solitary phalangeal or<br />

metacarpal lesions when survival is expected to exceed<br />

a few months. 348<br />

SOFT-TISSUE RECONSTRUCTION<br />

Fingertips<br />

The treatment objectives of fingertip amputations are<br />

as follows:<br />

close the wound<br />

maximize sensory return<br />

preserve length<br />

maintain joint function<br />

obtain a satisfactory cosmetic appearance 353–356<br />

Many variables affect the reconstructive choice:<br />

mechanism of injury; size of defect; location and status<br />

of wound; associated injuries to other parts of hand;<br />

and age, sex, general health, and occupation of patient.<br />

Healing by Secondary Intention<br />

If the skin loss is no larger than approximately 1.5 cm 2 ,<br />

the wound can be allowed to granulate and heal<br />

spontaneously. 357–359 Such treatment is especially well<br />

suited to children and the elderly. All devitalized tissue<br />

should undergo débridement, and any exposed bone<br />

should be trimmed to lie below the level of the soft<br />

tissue. The wound is covered with a semi-occlusive 360<br />

or alginate dressing, which can be left intact for 5 to 7<br />

days and can then be changed as necessary. Complete<br />

healing usually is achieved in 3 to 4 weeks. Mennen<br />

and Wiese 360 treated extensive fingertip defects by<br />

using this method and reported excellent functional


and cosmetic outcomes. The advantage of this<br />

treatment is that as the wound contracts, it pulls<br />

proximal innervated pulp skin over the exposed bone,<br />

resulting in a very small area of residual scar located<br />

off the pressure area of the finger. However, if the<br />

same technique is used to treat more dorsal fingertip<br />

defects with involvement of the distal nail bed, the<br />

subsequent wound contraction can lead to “parrot<br />

beaking” of the nail, which can be difficult to correct<br />

secondarily.<br />

Skin Grafts<br />

Skin grafts commonly are used to repair fingertip<br />

defects. They can be used as a temporizing measure<br />

with a view to subsequent flap revision, or they can<br />

serve as the definitive wound closure. In the former<br />

situation, split-thickness skin is more appropriate<br />

because it has a more predictable “take.” Similarly,<br />

large soft-tissue defects are resurfaced with split skin<br />

because it tends to contract more than full-thickness<br />

skin, thus keeping the resultant insensitive area as<br />

small as possible. 353 Split-thickness skin from the<br />

hypothenar eminence or instep of the foot has a<br />

papillary pattern that most closely resembles native<br />

fingertip skin. 361 Beasley 353 has suggested full-thickness<br />

donor sites from the groin to minimize the cosmetic<br />

deformity of the donor site. Hypothenar full-thickness<br />

skin grafts have an excellent texture match and do not<br />

hyperpigment as groin skin tends to. Their size is<br />

limited by the necessity to obtain primary closure of<br />

the donor site.<br />

Although some spontaneous reinnervation of fullthickness<br />

skin grafts has been observed, 362 any<br />

insensitive or hyposensitive areas that remain limit the<br />

application of skin grafts in the hand. 363 Braun et al. 364<br />

found no difference in 2-point discrimination between<br />

wounds covered by split-thickness grafts and those<br />

covered by local flaps.<br />

Flap Reconstruction<br />

Loss of fingertip pulp greater than one-third the length<br />

of the phalanx requires replacement of soft tissue to<br />

support the distal nail. Beasley 365 has offered the<br />

following guidelines for reconstruction in such cases:<br />

replacement soft tissue must have good<br />

ultimate sensibility and be capable of tolerating<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

normal usage<br />

secondary disfigurement must be insignificant,<br />

with no functional loss at donor site<br />

method must be safe, practical, reliable,<br />

economical, and predictable in results<br />

Beasley further lists three indications for local flaps in<br />

the repair of fingertip amputations: 1) wound bed<br />

unsuitable for revascularization of skin graft; 2) need<br />

for subcutaneous tissue replacement in addition to<br />

skin; 3) protection of vital structure, such as nerve.<br />

Flaps for reconstruction of soft tissue of the<br />

fingertip can be from the same finger (homodigital) or<br />

another finger (heterodigital) or from local, regional, or<br />

distant sources. 366–369 An enormous number of flaps<br />

have been described, and countless more descriptions<br />

will be published in the years ahead. For a flap to be<br />

useful clinically, it must fulfill the guidelines listed<br />

above, but at the same time, it must be reliable and<br />

simple to create. Only select flaps are discussed in the<br />

sections that follow.<br />

Homodigital Flaps<br />

The most immediate source of tissue for fingertip<br />

replacement is the same finger. The obvious<br />

advantages are that it does not violate another normal<br />

finger or part of the body nor does it immobilize<br />

uninvolved joints. The tissue used must be outside the<br />

zone of injury. The neurovascular integrity of the<br />

finger should be maintained.<br />

The tissue directly adjacent to the wound is the<br />

closest source of flap tissue and forms the basis for<br />

many traditionally popular flaps. The Atasoy volar V-Y<br />

advancement 369-371 is useful for dorsal oblique to<br />

transverse amputations in cases in which the defect<br />

does not exceed 1 cm (Fig. 11). The usefulness of the<br />

flap is vastly improved by extending the proximal part<br />

of the “V” past the distal interphalangeal joint crease<br />

and into the middle phalangeal segment and by<br />

elevating the flap as a true bilateral neurovascular<br />

island flap on both pedicles. 372<br />

In 1964, Moberg 373 described a rectangular volar<br />

advancement flap from the base of the thumb that can<br />

be used in thumb tip reconstruction. The volar<br />

advancement flap is a true axial flap in that the<br />

incisions are placed dorsal to the neurovascular<br />

bundles so as to include them with the flap and restore<br />

21


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

Figure 11. V-Y advancement flap. A, Skin incision and<br />

mobilization of triangular flap. B, Advancement of flap. C,<br />

Closure with V-Y technique. (Reprinted with permission from<br />

Chao et al. 369 )<br />

normal sensation to the tip. The tissue movement<br />

achieved in proportion to the extent of the dissection is<br />

disappointing, and if too large a defect is closed (>1<br />

cm), flexion contracture of the interphalangeal joint will<br />

occur. Several authors 374–376 subsequently modified the<br />

method of mobilization, incorporating a V-Y closure in<br />

the advancement to make the flap more reliable.<br />

Alternatively, the flap can be converted into a true<br />

island and the proximal defect can be skin grafted. 377<br />

Snow 378,379 applied the Moberg flap to the repair of<br />

fingertip amputations, but dorsal tip necrosis and an<br />

unstable pulp scar plagued the series. Macht and<br />

Watson 380 preserved the dorsal perforating vessels by<br />

using a “spreading-dissecting” technique with which<br />

the volar flap is not cut free except at its most distal<br />

22<br />

area. They reported no skin loss or joint stiffness<br />

occurring in 69 transfers and 2-point discrimination<br />

values within 2 mm of the contralateral normal finger.<br />

Lateral advancement flaps have the potential to<br />

offer the ideal fingertip reconstruction, replacing “like<br />

with like” from the same digit. Ipsilateral advancement<br />

flaps 369,381–386 move tissue from directly adjacent to the<br />

defect and maintain sensibility (Fig. 12). Bilateral<br />

advancement flaps can also be used, as described by<br />

Kutler 387 in 1944. As with all homodigital flaps, the<br />

potential exists for flap embarrassment if damaged<br />

tissues or pedicles are used.<br />

Figure 12. Oblique triangular flap. A, Volar oblique<br />

amputation. B, Design and raising of flap on digital<br />

neurovascular bundle. C, Closure of flap with V-Y technique.<br />

(Reprinted with permission from Chao et al. 369 )<br />

Reversed digital artery island flaps from the<br />

proximal finger necessitate sacrifice of one digital<br />

artery and rely on retrograde flow through an intact<br />

anastomosis with the contralateral normal artery. 388–391<br />

They require neurorrhaphy of a dorsal branch to the<br />

contralateral digital nerve for optimal recovery of<br />

sensibility. 392 A preoperative digital Allen’s test is<br />

essential to assess the patency of both arteries.<br />

Venous drainage of the flaps is via the soft tissue<br />

around the arterial pedicle, so the pedicle should not<br />

be skeletonized.


The dorsal middle phalangeal finger flap 393–395 can be<br />

raised on a short or long antegrade or retrograde<br />

pedicle and can be used as a free flap, an arterial and/or<br />

venous flow-through flap, or a neurovascular flap.<br />

Heterodigital Flaps<br />

In 1951, Cronin first described the cross-finger flap for<br />

fingertip reconstruction. 396 The cross-finger flap brings<br />

durable cover to exposed bone, joint, or flexor tendons<br />

when homodigital flaps do not suffice. 396–400 Blood<br />

supply of the cross-finger flap is random and based on<br />

the subdermal plexus of an adjacent digit. The flap can<br />

be based laterally, proximally, or distally, depending on<br />

the most comfortable approximation of donor digit to<br />

defect. The dorsum of the middle phalanges of the<br />

index, middle, and ring fingers is the most appropriate<br />

donor site in terms of joint immobilization. Use of a<br />

cross-finger flap from the volar aspect of the middle<br />

finger, rather than from the thinner dorsal finger skin,<br />

provides better tissue quality for resurfacing the pulp<br />

of the thumb. 365,401<br />

Hoskins details the technical points of cross-finger<br />

flap elevation and transfer (Fig. 13). 91,402 The pedicle can<br />

be divided safely by the 8th or 9th day to lessen the<br />

risk of joint stiffness from joint immobilization.<br />

Many variations of the cross-finger flap have been<br />

described. The dorsal sensory branch can be included in<br />

the flap and sutured to the digital nerve of the injured<br />

fingertip, 403 although that technique has not been shown<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

to improve the ultimate sensibility of the flap. The flap<br />

can be de-epithelialized and used to resurface dorsal<br />

defects of adjacent fingers, necessitating an additional<br />

skin graft on top of the flap. 404,405<br />

Advantages of the cross-finger flap technique are<br />

that it is easy to elevate and can carry ample quantities<br />

of similar tissue. Disadvantages are that it is a two-stage<br />

procedure, a skin graft is required for the donor site<br />

(which is obvious on the exposed dorsum of the finger),<br />

stiffness of the involved digits is a possibility, and 2point<br />

discrimination values average only 9 mm. 406,407<br />

In a study of 54 patients with cross-finger flaps,<br />

Nishikawa and Smith 407 found that despite recovery of<br />

protective sensation, no patient had recovered tactile<br />

gnosis. Maximal recovery of sensibility occurs in those<br />

younger than 20 years, and 2-point discrimination<br />

plateaus at 1 year. 406 Contraindications to the use of<br />

cross-finger flaps include arthritis, Dupuytren’s<br />

contracture, and generalized vasospastic syndromes.<br />

Littler 408 and Tubiana and Duparc 409 developed the<br />

technique of interdigital transfer of pedicled<br />

neurovascular island flaps. Pedicled neurovascular<br />

island flaps have found their greatest application in<br />

reconstruction of the ulnar thumb pulp, 410,411 with<br />

median nerve-innervated skin being transferred from<br />

the ulnar pulp of the middle finger (less desirably, the<br />

radial pulp of the ring finger). For the flap to reach the<br />

tip of the thumb, the digital nerve must be dissected<br />

well back into the median nerve and the proper digital<br />

Figure 13. Elevation and transfer of dorsal<br />

cross-finger flap. Full-thickness skin graft<br />

should be sutured to edge of defect adjacent<br />

to donor finger before flap is inset so that a<br />

“closed” system is created. (Reprinted with<br />

permission from Lister. 91 )<br />

23


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

artery to the adjacent finger must be sacrificed.<br />

Cortical misrepresentation remains a problem, and the<br />

sensibility of the transferred skin has been variable in<br />

several series. 412,413<br />

Holevich 414 reported a pedicled island flap from the<br />

dorsum of the index finger that is based on the first<br />

dorsal metacarpal artery. It includes a terminal branch<br />

of the radial nerve and can be used to resurface a<br />

shortened thumb. A problem exists with cortical<br />

interpretation, and the skin is not pulp skin. Several<br />

authors 415–417 later expanded the applications of the first<br />

dorsal metacarpal artery flap in hand resurfacing.<br />

Regional Flaps<br />

In 1926, Gatewood 418 first proposed a thenar flap<br />

for resurfacing the tip of the index finger in one<br />

patient. Thirty years later, Flatt 419 presented his results<br />

with a similar “palmar flap” in a large series of<br />

fingertip reconstructions.<br />

The classic thenar flap is based proximally to<br />

ensure good venous return and to minimize proximal<br />

interphalangeal joint flexion. Contracture can be<br />

further controlled by placing the thumb in full palmar<br />

abduction and bringing the metacarpophalangeal joint<br />

of the involved digit into full flexion. 353,420 If designed<br />

properly, the donor site usually can be closed<br />

primarily. 420,421 Unlike the true palmar flap, the thenar<br />

flap is not likely to produce joint stiffness<br />

postoperatively, provided the pedicle is divided in<br />

approximately 10 days.<br />

Small Defects of the Hand or Digits<br />

Homodigital Flaps<br />

Lai et al. 422 described the adipofascial turn-over flap<br />

with which dorsal defects of the finger and hand can<br />

be resurfaced by a flap of subcutaneous tissue hinged<br />

on a pedicle that borders the defect. This flap is<br />

especially useful in cases of abrasion injuries of the<br />

distal interphalangeal joint with exposed terminal<br />

extensor tendon. The donor site is closed primarily,<br />

and the flap is grafted (Fig. 14). 423<br />

Heterodigital Flaps<br />

Small defects of the hand can be resurfaced using socalled<br />

venous flaps. Venous flaps consist of skin islands<br />

raised on a single-vein pedicle from the dorsum of the<br />

24<br />

Figure 14. Surgical technique. A, Complex defect exposing<br />

dorsal aspect of distal interphalangeal joint. B, Design of<br />

adipofascial flap. Base of flap is adjacent to defect. C,<br />

Development of distally based adipofascial flap. D, Flap is<br />

turned over on itself to cover defect. E, Primary closure of<br />

donor site. Flap is covered with split-thickness skin graft.<br />

(Reprinted with permission from Al-Qattan. 423 )<br />

hand over the proximal phalanx and are used to<br />

reconstruct either the dorsal or volar surfaces of<br />

adjacent digits. 424–427<br />

Earley 428 detailed the anatomy of the second dorsal<br />

metacarpal artery and reported various uses for this<br />

neurovascular island flap hand reconstruction. He and<br />

others 428–431 broadened the applications of the second<br />

dorsal metacarpal artery flap.<br />

Regional Flaps<br />

Maruyama 432 and Quaba and Davison 433 elevated skin<br />

islands from the dorsum of the hand, based distally<br />

over the metacarpal head (Fig. 15). These reverse<br />

dorsal metacarpal artery flaps are sustained by


Figure 15. Design of reverse dorsal metacarpal flap and<br />

cross-section at distal flap (Reprinted with permission from<br />

Maruyama. 432 )<br />

interconnections between terminal branches of the<br />

dorsal metacarpal arteries and the deep digital and<br />

palmar arterial systems. 434–436 Maruyama raised flaps on<br />

all five dorsal metacarpal arteries and reported a<br />

largely successful experience in eight cases.<br />

Figure 16. Arterial basis of distally based dorsal hand flap is<br />

direct branch from dorsal metacarpal artery that enters skin<br />

0.5 to 1 cm proximal to adjacent metacarpophalangeal joint.<br />

(Reprinted with permission from Quaba and Davison. 433 )<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

In contrast, several authors 433,437 reported that the<br />

flaps are nourished by a direct cutaneous branch of the<br />

dorsal metacarpal artery that enters the skin 0.5 to 1<br />

cm proximal to the adjacent metacarpophalangeal joint<br />

(Fig. 16). The authors raised reverse dorsal metacarpal<br />

artery flaps on the second, third, and fourth<br />

intermetacarpal spaces in 21 patients and reported one<br />

partial loss and one failure. 433 Donor sites up to 2 cm<br />

wide can be closed primarily.<br />

Large Defects of the Hands or Digits<br />

Regional Flaps<br />

The regional flaps applicable for resurfacing the hand<br />

are based on the three major arteries of the forearm:<br />

the radial, ulnar, and posterior interosseous arteries. 438<br />

Yang et al. 439 described the territory of the radial<br />

forearm flap in 1981. The skin on the flexor surface of<br />

the forearm is relatively hairless, thin, and pliable,<br />

which makes it ideal for resurfacing the dorsum of the<br />

hand. The radial forearm unit can be raised as a<br />

composite of fascia-skin, 440–442 fascia, 443,444 bone-musclefascia-skin,<br />

445–447 or fascia-tendon-skin. 448–450<br />

In 1984, Lin et al. 451 noted ample retrograde flow<br />

into the radial artery from the ulnar artery via the deep<br />

palmar arch and proposed a “reverse” forearm flap.<br />

The flap is nourished by this retrograde circulation and<br />

can be elevated on its long pedicle for reconstruction<br />

anywhere in the hand. The authors described a crossover<br />

pattern of communicating branches between the paired<br />

venae comitantes and identified small superficial<br />

collateral branches of each vein, which effectively bypass<br />

the valves. This system enables the flap to be drained<br />

despite competent valves. Even in cases of significant<br />

hand trauma in which the palmar arches are in question,<br />

the flap has been successfully raised, based on<br />

communications proximal to the wrist. 452,453<br />

The radial forearm flap has two main<br />

disadvantages. Foremost is that a major vessel to the<br />

hand is sacrificed, but Kleinman and O’Connell 454<br />

found the only significant objective difference between<br />

patients who had undergone flap transfer and controls<br />

to be an 18% delay in reconstitution of normothermia<br />

after cold stress testing. Reconstruction of the vessel<br />

rarely is necessary. 455,456 Weinzweig et al. 457 described a<br />

technique for elevating a distally based<br />

fasciocutaneous flap with preservation of the radial<br />

25


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

artery, and Braun et al. 458 similarly elevated a<br />

retrograde radial fascial turn-down flap based on<br />

distal perforators of the radial artery, leaving the main<br />

radial artery intact.<br />

The unesthetic and potentially unstable grafted<br />

donor site of the radial forearm flap remains the<br />

major detractor of this otherwise excellent flap. 459 Skin<br />

graft take usually is not a problem with flaps used for<br />

hand reconstruction, because the flap is based<br />

proximally over the muscle bellies. If the flap needs<br />

to be raised in the distal forearm over the flexor<br />

tendons, graft take can be improved by a suprafascial<br />

dissection of the flap. 460 Many methods have been<br />

proposed to improve the donor site, including direct<br />

closure, full-thickness skin grafts, local flaps, and<br />

tissue expansion. 461–466 Split thickness skin grafting<br />

remains the standard at most centers.<br />

In 1984, Lovie et al. 467 described the ulnar artery<br />

island flap and 4 years later reported their experience<br />

with this method for hand and forearm<br />

reconstruction. 468 The skin territory of the flap overlies<br />

the proximal ulnar aspect of the forearm, which is<br />

almost always hairless and less visible than the radial<br />

border. The authors and others 469–472 found the ulnar<br />

flap to be superior in terms of esthetics, easier<br />

harvesting of bone and muscle (flexor carpi ulnaris),<br />

direct closure of donor site, and lower morbidity.<br />

The posterior interosseous artery flap is based on<br />

the communication between the anterior and posterior<br />

interosseous arteries. 473–478 The posterior interosseous<br />

artery runs in a fascial septum between the extensor<br />

carpi ulnaris and extensor digiti minimi muscles (Fig.<br />

17). 479 A segment of ulna can be taken as a composite<br />

flap. 480 The advantages of this flap are good pedicle<br />

length and primary closure of the donor site. Its<br />

disadvantages are a relatively hairy donor site, an<br />

obvious scar on the visible dorsum of the forearm,<br />

limited size of the flap, and unreliability of the<br />

vascular communication. 481–484<br />

Distant Flaps<br />

Large flaps of skin can be transferred to the hand from<br />

distant sites by means of traditional pedicled<br />

techniques or microvascular free tissue transfer.<br />

Pedicled flaps—Flaps of skin from remote sites<br />

over the chest and abdomen traditionally were used<br />

26<br />

Figure 17. Cross-section of distally based posterior<br />

interosseous island flap taken at middle one-third of forearm.<br />

Posterior interosseous artery reaches overlying skin in space<br />

between extensor carpi ulnaris and extensor digiti minimi<br />

proprius. (Reprinted with permission from Landi et al. 479 )<br />

for resurfacing large wounds of the upper extremity.<br />

The most commonly used pedicled flap is the groin<br />

flap based on the superficial circumflex iliac artery 485–488<br />

or the superficial inferior epigastric artery. 489 Groin<br />

flaps are axial-pattern flaps with reliable vascularity.<br />

However, they necessitate two surgical stages and the<br />

hand remains dependent during the initial period of<br />

flap attachment, encouraging edema and stiffness. In<br />

addition, groin flaps are too bulky for dorsal hand<br />

resurfacing and require subsequent revision surgery.<br />

Chow et al. 490 presented their experience with 36<br />

groin flaps used in delayed primary or elective<br />

secondary hand resurfacing. Arner and Möller 491<br />

highlighted potential complications.<br />

Microvascular Free Tissue Transfer—Microvascular<br />

free tissue transfer allows a single-stage composite<br />

reconstruction of complex hand defects, 492–500 obviating<br />

the need for cumbersome, two-stage pedicled<br />

procedures and their inherent shortcomings. Free flaps<br />

can also be used to provide vascular conduits and soft<br />

tissue coverage. 501,502 Free flaps are the definitive form<br />

of soft-tissue cover in emergency situations. 503–508<br />

Successful reconstruction of soft tissue of the upper<br />

extremity with free flaps must be approached with the<br />

goals of providing stable coverage and, more<br />

importantly, restoring function. The hand does not<br />

tolerate prolonged immobilization. Radical débridement<br />

and restoration of all tissue components at the time of<br />

coverage encourages early mobilization. 509


Critical sensibility of the fingertip can be restored by<br />

free neurosensory flaps 510–516 or microvascular toe-pulp<br />

transfer. 517–519 Toe-to-hand transfers in cases of thumb<br />

reconstruction are discussed in the “Microsurgery: Free<br />

Tissue Transfer and Replantation” issue of Selected<br />

Readings in <strong>Plastic</strong> <strong>Surgery</strong>. Protective sensibility of the<br />

palm and dorsum of the hand usually is achieved by<br />

thin muscle, fascial, or fasciocutaneous flaps. 520<br />

The first web space flap of the foot is the “gold<br />

standard” of neurosensory flaps. 513 It consists of the<br />

lateral aspect of the great toe and the medial aspect of<br />

the second toe. The flap is supplied by the first dorsal<br />

metatarsal artery, a branch of the dorsalis pedis artery,<br />

or the first plantar metatarsal artery. Its innervation is<br />

through both the deep peroneal nerve and the medial<br />

plantar nerve (Fig. 18). 511 Lee and May 516 found that the<br />

first dorsal metatarsal artery arose from the dorsalis<br />

pedis artery dorsal to the mid-metatarsal axis in 78%<br />

of 50 cadaver dissections. The authors usually obtain<br />

preoperative angiography to determine the vascular<br />

anatomy. The main advantage of the first web space<br />

flap for sensory reconstruction in the hand is<br />

replacement with similar thin glabrous skin with<br />

concentrated sensory receptors, allowing the best 2point<br />

discrimination of any neurosensory flap.<br />

The thin, malleable skin over the dorsum of the<br />

foot can also be transferred as an innervated free<br />

flap, 521–523 including the underlying extensor tendons 524–527<br />

and second metatarsal for composite reconstruction, if<br />

required. The dorsalis pedis flap is raised on the<br />

dorsalis pedis artery, and venous drainage is via the<br />

venae comitantes and saphenous vein. Its neural input<br />

is from the superficial peroneal nerve. The donor site is<br />

unforgiving, so meticulous attention must be paid to<br />

flap dissection and wound care.<br />

The free radial forearm flap and free ulnar forearm<br />

flap can be used just as readily as the already<br />

discussed pedicled flaps. They have neurosensory<br />

potential via the lateral and medial cutaneous nerves<br />

of the forearm, respectively.<br />

The lateral arm flap is supplied by the posterior<br />

radial collateral artery and innervated by the posterior<br />

cutaneous nerve of the arm. 528–530 It can be raised as a<br />

fasciocutaneous flap or as combinations of fascia, 531<br />

muscle, tendon, 532,533 and bone. 534 Donor defects up to 6<br />

cm wide usually can be closed primarily. Designs for<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

Figure 18. Innervation of the foot first web space and great<br />

toe. (Reprinted with permission from May et al. 511 )<br />

extending the flap have been described, 535,536 as have<br />

techniques for extending the length of the vascular<br />

pedicle. 537 The flap has the advantage of confining flap<br />

harvest to the same extremity as the defect. However,<br />

this popular flap comes with a price. Graham et al. 538<br />

reviewed 123 lateral arm flaps and found that a<br />

significant number of patients complained of<br />

unsatisfactory appearance and hypersensitivity of the<br />

donor site, elbow pain, numbness in the forearm, and<br />

excessive flap bulk.<br />

For large defects of the upper extremity, where<br />

sensibility is not as important, the scapular and<br />

parascapular flaps have found popularity. The<br />

parascapular flap 539–541 allows a larger skin paddle to be<br />

harvested with primary closure of the secondary<br />

defect, and the resulting scar is less conspicuous than<br />

that of the horizontal scapular flap defect. The scapular<br />

flap can be raised as a fascial flap 542 or as an<br />

osteofascial flap. 543 Both flaps have the disadvantage of<br />

being bulky, even in thin individuals, and secondary<br />

defatting or liposuction is necessary for an optimal<br />

aesthetic contour.<br />

27


<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

The free groin flap constitutes an unsurpassed<br />

donor site and allows the transfer of a large quantity of<br />

hairless skin. Like the pedicled groin flap, it is too<br />

bulky for resurfacing the hand and requires revision<br />

defatting and/or liposuction.<br />

Recent interest in perforator flaps has led to the<br />

growing popularity of the anterolateral thigh flap 544,545<br />

and the tensor fasciae latae perforator flap 546,547 in<br />

dorsal hand reconstruction. Large flaps of very thin<br />

skin can be raised with minimal donor site<br />

morbidity. Because the flaps are based on perforating<br />

vessels, the motor function of the underlying tensor<br />

fascia latae is preserved.<br />

The anatomy of the temporal region has been<br />

elucidated by several authors. 548–550 Upton et al. 551<br />

discussed the various applications of free<br />

temporoparietal fascial flaps in dorsal hand<br />

resurfacing. Temporoparietal fascia most commonly is<br />

used in the upper extremity to wrap exposed or<br />

contracted tendons. 551–556 The deep areolar surface of the<br />

flap is turned toward the tendons to provide a smooth<br />

gliding surface. The overlying fascia is thin and pliable<br />

for metacarpal contouring. A skin graft completes the<br />

reconstruction. This fascial flap is also excellent for<br />

filling the three-dimensional defect resulting from the<br />

extensive release of complex first web space<br />

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contractures. The donor defect on the scalp is<br />

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Another extremely thin fascial flap is the serratus<br />

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Free muscle flaps can provide only crude<br />

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105. Dixon JH. Non-tuberculous mycobacterial<br />

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report of six cases. J Bone Joint Surg Br<br />

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106. Adams RM, Remington JS, Steinberg J, Seibert JS.<br />

Tropical fish aquariums: A source of<br />

Mycobacterium marinum infections resembling<br />

sporotrichosis. JAMA 1970;211:457–461.<br />

107. Williams CS, Riordan DC. Mycobacterium<br />

marinum (atypical acid-fast bacillus) infections of<br />

the hand. J Bone Joint Surg Am 1973;55:1042–1050.<br />

108. Wendt JR, Lamm RC, Altman DI, Cruz HG,<br />

Achauer BM. An unusually aggressive<br />

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JL, Dattwyler RJ. Mycobacterium marinum<br />

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110. Kaplan H, Clayton M. Carpal tunnel syndrome<br />

secondary to Mycobacterium kansasii infection.<br />

JAMA 1969;208:1186–1188.<br />

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532. Gosain AK, Matloub HS, Yousif NJ, Sanger JR.<br />

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533. Hou SM, Liu TK. Vascularized tendon graft using<br />

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534. Arnez ZM, Kersnic M, Smith RW, Godina M.<br />

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535. Kuek LB, Chuan TL. The extended lateral arm<br />

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539. Nassif TM, Vidal L, Bovet JL, Baudet J. The<br />

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540. Fissette J, Lahaye T, Colot G. The use of the free<br />

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541. Burns JT, Schlafly B. Use of the parascapular flap<br />

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542. Jin YT, Cao HP, Chang TS. Clinical application of<br />

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543. Datiashvili RO, Shibaev EYu, Chichkin VG,<br />

Oganesian AR. Reconstruction of a complex<br />

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544. Luo S, Raffoul W, Luo J, Luo L, Gao J, Chen L,<br />

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553. Chowdary RP. Use of temporoparietal fascia free<br />

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48


RECOMMENDED READING<br />

Al-Qattan MM. The adipofascial turnover flap for coverage<br />

of the exposed distal interphalangeal joint of the<br />

fingers and the interphalangeal joint of the thumb. J<br />

Hand Surg [Am] 2001;26:1116-1119.<br />

Brown DM, Young VL. Hand infections. South Med J<br />

1993;86:56-66.<br />

Cavanagh S, Pho RW. The reverse radial forearm flap<br />

in the severely injured hand: An anatomical and clinical<br />

study. J Hand Surg [Br] 1992;17:501-503.<br />

Chuang DC, Colony LH, Chen HC, Wei FC. Groin flap<br />

design and versatility. Plast Reconstr Surg 1989;84:100-<br />

107.<br />

Glasson DW, Lovie MJ. The ulnar island flap in hand<br />

and forearm reconstruction. Br J Plast Surg 1988;41:349-<br />

353.<br />

Hoffman RD, Adams BD. The role of antibiotics in the<br />

management of elective and post-traumatic hand surgery.<br />

Hand Clin 1998;14:657-666.<br />

Lee WP, May JW Jr. Neurosensory free flaps to the<br />

hand: Indications and donor selection. Hand Clin<br />

1992;8:465-477.<br />

Mankin HJ. Principles of diagnosis and management<br />

of tumors of the hand. Hand Clin 1987;3:185-195.<br />

Ninkovic M, Deetjen H, Ohler K, Anderl H.<br />

Emergency free tissue transfer for severe upper<br />

extremity injuries. J Hand Surg [Br] 1995;208:53-58.<br />

Ninkovic MM, Schwabegger AH, Wechselberger G,<br />

Anderl H. Reconstruction of large palmar defects of<br />

the hand using free flaps. J Hand Surg [Br] 1997;22:623-<br />

630.<br />

Quaba AA, Davison PM. The distally-based dorsal<br />

hand flap. Br J Plast Surg 1990;43:28-39.<br />

<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

Quinn MJ, Thompson JE, Crotty K, McCarthy WH,<br />

Coates AS. Subungual melanoma in the hand. J Hand<br />

Surg [Am] 1996;21:506-511.<br />

Small JO, Brennen MD. The first dorsal metacarpal<br />

artery neurovascular island flap. J Hand Surg [Br]<br />

1988;138:136-145.<br />

Zancolli EA, Angrigiani C. Posterior interosseous<br />

island forearm flap. J Hand Surg [Br] 1988;13:130-135.<br />

Zook EG. Anatomy and physiology of the perionychium.<br />

Hand Clin 1990;6:1-7.<br />

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<strong>SR<strong>PS</strong></strong> Volume 10, Issue 25, 2009<br />

50


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