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laxity on wear and joint kinematics and the absence of the anterior cruciate ligament has notbeen sufficiently taken into account in simulator wear studies. The aim of this study was toinvestigate different ligament and soft tissue models with respect to wear and kinematics. Avirtual soft tissue control system was used to simulate different motion restraints in a forcecontrolledknee wear simulator. The application of more realistic and sophisticated ligamentmodels that considered the absence of anterior cruciate ligament lead to a significant increase inpolyethylene wear (p=0.02) and joint kinematics (p
the intact cruciate ligaments. For the second test, asymmetric-nonlinear motion restraints wereadopted from biomechanical studies that simulated the clinical situation of a sectioned ACL(Fukubayashi et al., 1982, Kanamori et al., 2002). The ligament models are shown in Figure 1(AP translation) and Figure 2 (IE rotation).Motion restraints for sectioned ACL were implemented according to the following polynomialequations:For AP motion the restraining force (RF AP ) is valid in a specific value range (V AP ) anddepends on the AP displacement (x AP ):RF AP = 5.66 âˆ 10 -4 (N/mm 5 ) âˆ x5 AP - 2.02 âˆ 10 -2 (N/mm 4 ) âˆ x4 AP + 0.27(N/mm 3 ) âˆ x3 AP - 1.09 (N/mm 2 ) âˆ x2 AP + 2.60 (N/mm) âˆ x AP + 1.90Nwith: VAP= {xAP Ñ” IR â”‚-10 < xAP < 20}For IE motion the restraining torque (RT IE ) depends on IE rotation (x IE ), valid for a specificvalue range (V IE ):RT IE = 0.20 âˆ 10 -5 (Nm/deg 5 ) âˆ x5 IE + 0.25 âˆ 10 -4 (Nm/deg 4 ) âˆ x4 IE - 4.13 âˆ10 -4 (Nm/deg 3 ) âˆ x3 IE - 2.32 âˆ 10 -3 (Nm/deg 2 ) âˆ x2 IE + 0.31 (Nm/deg) âˆ x IE –1.68Nmwith: V IE = {x IE Ñ” IR â”‚-20 < x IE < 20}The only parameter to be altered in both tests was the motion restraint. This allowed differentmotion restraints to be investigated separately.For each wear test, three wear specimens and one soak control specimen were used. Anultracongruent fixed bearing design (Columbus ® UC, Aesculap AG, Tuttlingen, Germany) wasevaluated in this study (Figure 3). The medium-sized components were manufactured in asimilar manner: the femoral components and tibial trays were made of cast CoCr29Mo6 alloyaccording to ISO 5832-4:1996(E) and tibial inserts were made of UHMWPE (GUR 1020)according to ISO 5834-2:2006(E). The thickness of the γ-irradiated (Dose: ~30kGy) tibialinserts was 10mm. Force-controlled simulation according to ISO 14243-1:2002(E) was carriedout on a modified (Kretzer et al., 2008) AMTI knee simulator (Model KS2-6-1000, AdvancedMechanical Technology Inc., Watertown, MA, USA) (Figure 4). A virtual soft tissue controlsystem according to White et al. (2006) was used to simulate the different motion restraints.The virtual soft tissue control system embodies the relationship between configuration andrestraint force in a real-time, cubic-spline algorithm for each controlled degree-of-freedom. Thecubic-spline can be modified so as to permit the settings of different input-output relationshipssuch as linear, nonlinear, and asymmetric relationships, which represent the desiredcharacteristics of soft-tissue restraint.The following test parameters were employed according to the ISO 14243-1:2002(E) standard:a maximum load of 2600N, a flexion angle of 0° to 58°, an AP force of -265N to 110N, and anIE torque of -1Nm to 6Nm. Compressive load was offset medially 5.2mm from the varus-valgusrotational axis to create higher forces on the medial compartment (Andriacchi et al., 1986,Harrington 1983, Kretzer et al., 2008). Simulation lasted for a total of 5,000,000 loading cyclesat a frequency of 1Hz. Prior to simulation, the tibial inserts were presoaked in serum andgravimetrically measured at weekly intervals until the incremental mass change of the insertswas less than 10% of the cumulative mass change. Only compressive load was applied to thesoak control specimens during the course of the simulation. Magnitude and frequency of thecompressive load were the same for the soak control and wear specimens. After every 500,000cycles, all components (wear specimens and soak controls) were cleaned and gravimetricallymeasured according to ISO 14243-2:2000(E). The weight change of each wear specimen wascorrected for fluid absorption by subtracting the weight gain of the load soak control at eachfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]
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Convened under the auspicious of es
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Special Thank YouISTA’s Board of
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Invited SpeakersJean Noel ArgensonM
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Thursday, October 7, 2010Session AS
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Oxinium Versus Metal on Polyethylen
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13:30 - 14:00Invited talk: Hip Arth
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What Can We Do With Periprosthetic
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New Concept in Soft Tissue Balancin
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Comparison of Drain Clamp After Bil
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Session - A7:45 - 8:15Invited talk:
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Massive Endoprosthetic Replacement
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Hydroxyapatite Block for Reconstruc
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13. Dilute Betadine Lavage Prior to
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37. Fluoroscopic Analysis of Advanc
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60. Influence of Impaction Forces o
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85. Surgical Wound Infection as a P
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Saturday, October 9, 2010, 8:15-9:0
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algorithm was tested for short incr
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Ten patients with fracture acetabul
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Saturday, October 9, 2010, 14:00-14
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*Email: drbaldiniandrea@yahoo.itThe
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evision surgery were aseptic loosen
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*Dante Parodi - Clinica Alemana De
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Thursday, October 7, 2010, 17:30-18
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and subsequent exposure time to rad
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of the patient during the acetabula
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FiguresFriday, October 8, 2010, 11:
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Results: No further revisions were
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Minimally Invasive Total Knee Arthr
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and are due to insufficient fixatio
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Methods: An inverse finite element
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Finally a subject-specific model co
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prosthesis component have been calc
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novel tools and devices that are ab
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from 48.6 to 92.2, while functional
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Friday, October 8, 2010, 8:00-8:30S
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The Kaplan-Meier survival rate was
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especially because most of the stan
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knee and offer a new development of
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This was the patient with revision
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Ain Shams UniversityCairo, EgyptPle
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Two-stage revision arthroplasty is
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inexpensive modular femoral compone
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successful treatment outcome was de
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Pathogen N PercentStaphylococcus au
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component as their permanent prosth
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FiguresFigure 1Friday, October 8, 2
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*Email: joseph.fetto@nyumc.orgNon-c
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MATERIAL AND METHODS423 total knee
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MATERIALS AND METHODSFrom January 1
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Introduction:Mike Reed - Wansbeck G
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Conclusions:To the best our knowled
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ing superior clinical results when
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one) in 11 (26%), type II (failure
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Correction of leg length discrepanc
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motion is separated from the transv
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Is the Frecnh Paradox a Reality? Lo
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uncovered in the remaining 53 hips.
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found in the currently used MOM bea
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followed since their initial presen
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ã€€On the axial plane, the ave
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For revision hip replacements, the
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Friday, October 8, 2010, 15:20-16:0
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ResultCup geometries with screws ha
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to insert the guide pin into the fe
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to 8% of THA patients have cups mal
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In a recent investigation the effec
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Conclusions.Fixed valgus angle rese
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fluoroscopic analysis of kinematics
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vivo motion of MB total knee arthro
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ResultsMean follow-up was 6 yrs (SD
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precision of implant placement. We
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*J. Philippe Kretzer - Laboratory o
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COM group whereas both components w
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In the present study, the patella h
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characteristic of the MB prosthesis
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Friday, October 8, 2010, 15:00-16:0
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The ceramic on ceramic strategy wit
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acetabulum, which with a modern por
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Friday, October 8, 2010, 14:00-14:5
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Conclusion: The results of this stu
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The incidence of periprosthetic fra
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*Email: sgh_iizu@grn.janis.or.jpAbs
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components (78 %) that remained rig
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hydroxyapatite ceramic in bone tumo
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one month later to a mean value of
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Keywords: total knee arthroplasty,
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of the tensor (Fig. 1B). During eac
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structures including MCL cut for ac
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31. Whiteside LA, Kasselt MR, Hayne
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Corne van Loon - rijnstate hospital
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Osaka, JapanTomonori Arita - Gradua
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Gary Poehling - Wake forest univers
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mean Harris hip score was 98 points
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Discussion:This study demonstrates
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Thursday, October 7, 2010, 8:00-8:5
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we usually excise both ACL & PCL, s
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true and false acetabulum2- In Femo
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Minimal invasive surgery (MIS)is ac
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*Stephen Murphy - New England Bapti
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scratching effect against the femor
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transformation associated with the
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Bearing Surfaces in Primary Total H
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Introduction: Proper rotational ali
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Materials and Method4 cases and 5 k
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to improve exposure in difficult ca
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We have used different stems (strai
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Our preliminary results are encoura
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A modified titanium spinal pedicle
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Use of a novel ligament gap balanci
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femur 659, proximal tibia 198, prox
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*Pietro Ruggieri - University of Bo
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The presentattion will focus on tec
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Accuracy of Femoral Component Align
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Results.Dislocation: no.Clinical ou
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iocompatible material to man,it is
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BackgroundThe current literature te
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axis and component positioning. We
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stability of joint in full extensio
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with femoralrevision combined with
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arthroplasty. Obesity is an appropr
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Conclusions:We conclude that with u
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There was no difference in function
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We present the results of a consecu
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Barbara Maestri - university of rom
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gap balancing and providing reasona
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Highly Crosslinked PE as Alternativ
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plastic limit of UHMWPe. Changes in
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equired blood transfusion (RD -0.34
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age limit for THA can be lowered.Fr
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lood transfusion might be necessary
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The hammering sounds in press-fit i
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We investigated the period from fir
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technique.The subjects were 16 knee
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Persistent patellofemoral symptoms
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peak dynamic varus angle over time.
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slope on the medial side was minima
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for the follow-up examination. A te
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Tateaki Shimakawa - Tokushima Munic
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male.We retrospectively reviewed pr
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affected the interface stresses cal
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Introduction:Cadaveric Evaluation o
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defects.Conclusion: Periprosthetic
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FiguresFigure 1 Figure 2 Figure 3 F
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Poster: 4Testing High Performance A
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Background:Modular endoprosthetic r
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The mean follow up was 4.2 years (3
Page 344 and 345: compared to the attending surgeon.D
Page 346 and 347: Poster: 13Postural Control Features
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Page 350 and 351: Poster: 17A Novel Method to Determi
Page 352 and 353: and it’s the highest rate has bee
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Page 356 and 357: Poster: 23Lumbar Disc Replacement.
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Page 360 and 361: Poster: 27Accuracy of Acetabular Cu
Page 362 and 363: Poster: 29In Vivo Measurement of Pe
Page 364 and 365: Poster: 31Clinical and Laboratory V
Page 366 and 367: Figure 1: Typical steps used for co
Page 368 and 369: Alignment & bonecutting errorsMeanT
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Page 372 and 373: 17. Jonsson B, Astrom J. Alignment
Page 374 and 375: Branislav Jaramaz - The Western Pen
Page 376 and 377: Poster: 34What Is the Blood Transfu
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Page 380 and 381: Poster: 38Intraarticular Injection
Page 382 and 383: Sudhir Rao - South London Heathcare
Page 384 and 385: *Naoyuki Katayama - Hokkaido Orthop
Page 386 and 387: 198.5±5.5°and 157.0±7.5°, respe
Page 388 and 389: Introduction*Sujith Konan - Univers
Page 390 and 391: Poster: 48IntroductionRevision Hip
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Page 396 and 397: measurement interval. The wear rate
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Page 402 and 403: Poster: 52Development of a Constant
Page 404 and 405: *Takahiro Lida - Osaka City Univers
Page 406 and 407: coating, have been developed with t
Page 408 and 409: 3. Push-out Biomechanical AnalysisM
Page 410 and 411: anodized/hydrothermally treated tit
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Page 416 and 417: Lucia Manunta - University - sassar
Page 418 and 419: Based on above measurement we had t
Page 420 and 421: 3, 6, 12, 18, and 24 months post-op
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Page 424 and 425: Conclusion: the longivity of hip ar
Page 426 and 427: Poster: 70Outcome of Ceramic-Cerami
Page 428 and 429: posterior structures (facets and fa
Page 430 and 431: After thirty-eight months in vivo,
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Page 436 and 437: Metal cups, embedded in a cast resi
Page 438 and 439: about their preferences regarding f
Page 440 and 441: A periprosthetic femoral fracture a
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International scientific literature
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were balanced to within 2° to 3°
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ecause of deep infction. One was ma
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Poster: 91So Are Sutures Actually B
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patients having staged bilateral pr
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adiographs often underestimate the
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A total of 7 osteoarthritis hip wer
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Poster: 98Appropriate Spatial Desig
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Poster: 100Total Hip Arthroplasty i
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Poster: 102Aggressive Early Debride
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this study was to assess the agreem
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Hemiarthroplasty - an Innovative Me
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p=0.55. This minimal change in leng
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Poster: 109Severe Persistent Synovi
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*Email: jerome.tonetti@free.frIn pr
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in 5 QFT-G positive patients with a
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arthroplasty (TKA). In the other ha
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