POSTER ABSTRACTS - ISAKOS

diagnosis of knee pain in young patients with no
history of trauma.
E-poster #802
Injuries in Naval Special Warfare Sea, Air and
Land (Seal) Personnel: Epidemiology and
Surgical Management of this New Elite Athlete
Shaun N Peterson, Suffolk, VA, USA, Presenter
John K Sekiya, Portsmouth, VA USA
Michael H Call, Virginia Beach, VA USA
Daniel V Unger, Portsmouth, VA USA
Bone and Joint Institute, Naval Medical Center,
Portsmouth, VA, USA
Purpose: No previous studies have been
performed looking at the epidemiology of injuries
within the Naval Special Warfare (SEAL)
commands. The purpose of this study is to
determine the injury incidence of the Naval
Special Warfare community and correlate these
injuries with surgical management.
Methods: Subjects included personnel assigned
to our East Coast SEAL commands, including
SEAL operators, Special Boat squadrons,
Explosive Ordinance and Disposal staff, supply
and logistics teams, and medical support, that
presented to our clinic during a 3-year period. The
diagnoses obtained from clinic visits were
stratified according to body part and location, and
further subdivided according to ICD-9 diagnostic
codes. The surgical management of these same
patients was correlated to the corresponding ICD-
9 diagnosis and also subdivided according to
body part and location.
Results: A total of 1,165 clinic visits and 169
surgeries were recorded during the study period.
While back/neck injuries were most common,
(27%, 308), the majority were successfully treated
with non-operative methods (6% visits progressed
to surgery). The knee (21%,243) and shoulder
(19%,219) were the 2nd and 3rd most common
reasons for clinic visits, and most frequently went
on to surgical management following presentation
(33% knee, 32% shoulder). The 3 most common
diagnoses were shoulder bursitis, lumbar
sprain/sprain, and ankle sprain/instability. The 3
most common surgeries were arthroscopy
meniscectomy, distal clavicle excision, and
subacromial decompression.
Conclusions: The SEAL commands have a high
percentage of injuries that progress to surgical
intervention. Mission and training demands may
all contribute to delays in seeking medical
attention until injuries that would have been
amenable to rehabilitation become surgical. The
diverse nature of their injuries may be secondary
to their high level of performance and need to
perform a variety of activities including climbing,
swimming, diving, running, jumping, and hand to
hand combat. This research has allowed us to
better stratify the injury patterns in the Naval
Special Warfare community and direct future
preventive and rehabilitative efforts to reduce the
risk of injury and the incidence of overuse injuries.
This is truly a unique elite athlete with a pattern
of injuries and treatment that has not been
previously described.
E-poster #803
Ultracongruent-type Total Knee Arthroplasty
versus Posterior Stabilized-type Total Knee
Arthroplasty - Prospective Randomized
Comparison for Postoperative Stability
Kenzo Takatoku, Kawachi Gun Minami Kawachi,
Tochigi JAPAN,
Hisashi Takada, Tochigi, JAPAN
Kakuko Tobita, Nikko, Tochigi JAPAN
Munetada Kamimoto, Tochigi, JAPAN
Yusei Kariya, Tochigi, JAPAN
Hitoshi Sekiya, JAPAN, Presenter
Jichi Medical School, Tochigi, JAPAN
Posterior stabilized (PS) type knee prosthesis is
one of the most prevalent types of total knee
arthroplasty (TKA) supported by long-term
favorable results. However, it has some
drawbacks such as patellar clunk, knee
dislocation, tibial spine wear and breakage, and
click sensation during knee flexion. One possible
solution for these problems is usage of
ultracongruent (UC) type knee prosthesis which
has a high anterior lip and deep dished surface to
enhance the congruity to femoral prosthesis. To
clarify the stabilizing effect of UC knee prosthesis,
stability of two types of knee prostheses were
compared. We had prospectively performed two
types of TKA made by the same manufacturer
(Natural Knee ® total knee system, Centerpulse
Inc, Zurich, SWITZERLAND). PS and UC type
prostheses were used in 36 and 37 knees,
respectively. Distribution of patient age, sex,
causative disease, and preoperative range of
motion were similar in both groups. One year or
more after the surgery, stability of the knee was
evaluated. Lateral stability was evaluated using
with Telos stress machine ® at 15 degrees of knee
flexion applying the varus or valgus force of 70 N.
Anteroposterior laxity was evaluated using the KT-