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male.We retrospectively reviewed pre and post operative notes from 406 consecutive TKA patientsfrom a single surgeon. Intraoperative data included the integrity of the three compartments andthe ACL.Results:At only six weeks follow-up, patients recovered their pre-operative ROM (p=0.37). KneeSociety Knee scores (knee and function) and WOMAC scores (pain, function and total)significantly improved from pre-operative values at every follow-up of 6 weeks, 6 months and 1year (p
the Femoral Component?*Jorrit Zelle - Radboud University Nijmegen Medical Centre - Nijmegen, The NetherlandsMaarten De Waal Malefijt - Radboud University Nijmegen Medical Centre - Nijmegen, TheNetherlandsNico Verdonschot - Radboud University Nijmegen Medical Centre - Nijmegen, NetherlandsIntroduction*Email: j.zelle@orthop.umcn.nlHigh-flexion knee implants have been developed to accommodate a large range of motion(ROM > 120°) after total knee arthroplasty (TKA). In a recent follow-up study, Han et al. [1]reported a disturbingly high incidence of femoral loosening for high-flexion TKA. The femoralcomponent loosened particularly at the implant-cement interface. Highly flexed knee implantsmay be more sensitive to femoral loosening as the knee load is high during deep knee flexion[2], which may result in increased tensile and/or shear stresses at the femoral implant fixation.The objective of this study was to analyse the load-transfer mechanism at the femoral implantcementinterface during deep knee flexion (ROM ≤ 155°). For this purpose, a three-dimensionalfinite element (FE) knee model was developed including high-flexion TKA components. Zerothicknesscohesive elements were used to model the femoral implant-cement interface. Theresearch questions addressed in this study were whether high-flexion leads to an increasedtensile and/or shear stress at the femoral implant-cement interface and whether this would leadto an increased risk of femoral loosening.Materials & methodsThe FE knee model utilized in this study has been described previously [3] and consisted of aproximal tibia and fibula, TKA components, a quadriceps and patella tendon and a nonresurfacedpatella. For use in this study, the distal femur was integrated in the FE modelincluding cohesive interface elements and a 1 mm bone cement layer. High-flexion TKAcomponents of the posterior-stabilised PFC Sigma RP-F (DePuy, J&J, USA) were incorporatedin the FE knee model following the surgical procedure provided by the manufacturer. A fullweight-bearing squatting cycle was simulated (ROM = 50°-155°). The interface stressescalculated by the FE knee model were decomposed into tension, compression and shearcomponents. The strength of the femoral implant-cement interface was determinedexperimentally using interface specimens to predict whether a local interface stress-statecalculated by the FE knee model would lead to interface debonding.ResultsDuring deep knee flexion, tensile stress concentrations were found at the femoral implantcementinterface particularly beneath the anterior flange. Shear stress concentrations wereobserved at the interface beneath the anterior flange and the posterior femoral condyles. Thepeak tensile interface stress increased from 1.6 MPa at 120° of flexion to 5.5 MPa during deepknee flexion at the interface beneath the anterior flange. The peak shear stress was even higherat this interface location and increased from 4.1 MPa at 120° of flexion to 11.0 MPa at maximalflexion (155°). Based on the interface strength experiments, 5.8% of the interface beneath theanterior flange was predicted to debond at 120° of flexion, which increased to 10.8% duringdeep knee flexion.DiscussionObviously, the FE knee model utilized in this study contains limitations which may havefile:///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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Thursday, October 7, 2010, 8:30-9:2
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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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Page 276 and 277: iocompatible material to man,it is
Page 278 and 279: BackgroundThe current literature te
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Page 288 and 289: Conclusions:We conclude that with u
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Page 292 and 293: We present the results of a consecu
Page 294 and 295: Barbara Maestri - university of rom
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Page 298 and 299: Highly Crosslinked PE as Alternativ
Page 300 and 301: plastic limit of UHMWPe. Changes in
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Page 304 and 305: age limit for THA can be lowered.Fr
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Page 312 and 313: We investigated the period from fir
Page 314 and 315: technique.The subjects were 16 knee
Page 316 and 317: Persistent patellofemoral symptoms
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Page 324 and 325: Tateaki Shimakawa - Tokushima Munic
Page 328 and 329: affected the interface stresses cal
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Page 332 and 333: Introduction:Cadaveric Evaluation o
Page 334 and 335: defects.Conclusion: Periprosthetic
Page 336 and 337: FiguresFigure 1 Figure 2 Figure 3 F
Page 338 and 339: Poster: 4Testing High Performance A
Page 340 and 341: Background:Modular endoprosthetic r
Page 342 and 343: 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
Page 348 and 349: e extended to the cup with malposit
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
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Poster: 34What Is the Blood Transfu
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dislocation after total hip arthrop
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Poster: 38Intraarticular Injection
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Sudhir Rao - South London Heathcare
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*Naoyuki Katayama - Hokkaido Orthop
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198.5±5.5°and 157.0±7.5°, respe
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Introduction*Sujith Konan - Univers
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Poster: 48IntroductionRevision Hip
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In conclusion we have developed a s
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laxity on wear and joint kinematics
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measurement interval. The wear rate
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spring model for AP translation and
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Haider, H., Walker, P. S., 2002. An
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Poster: 52Development of a Constant
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*Takahiro Lida - Osaka City Univers
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coating, have been developed with t
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3. Push-out Biomechanical AnalysisM
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anodized/hydrothermally treated tit
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However, she then suffered from sev
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central osteophytes in hip osteoart
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Lucia Manunta - University - sassar
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Based on above measurement we had t
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3, 6, 12, 18, and 24 months post-op
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amorphous and degrades faster in th
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Conclusion: the longivity of hip ar
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Poster: 70Outcome of Ceramic-Cerami
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posterior structures (facets and fa
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After thirty-eight months in vivo,
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disadvantages are provided by this
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chipping of the insert. Therefore a
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Metal cups, embedded in a cast resi
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about their preferences regarding f
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A periprosthetic femoral fracture a
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Superficial wound infection occurre
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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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