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independent observer. Bone loss was determined by Paprosky’s classification. Osseointegrationwas assessed by a slight modification of the criteria of Engh et al. Femoral restoration wasclassified according to Kolstad et al. Pain and function was documented using Harris Hip Score(HHS).Results: Mean patient age was 68.3 years and radiographic follow-up 6.2 years. 74% femorahad type 3 or 4 bone loss. All distal segments were radiographically osseointegrated. Proximalsegment radiolucent lines were frequent (40%). Early minor subsidence occured in 4 (6.2%)hips. Definite bony regeneration was documented in 73% femora and stress-shielding in 26%.HHS improved from a pre-operative mean of 50.1 points to 86.2 at most recent follow-up.Discussion: A consistent pattern of bony remodeling and osseointegration occurred which couldbe applied for assessment of fixation and stability of this stem. The well established criteria ofosseointegration for cylindrical cobalt-chrome stems may have to be altered for application tothese stems as the mechanism of load transfer is entirely different. Stems with diameter of18mm or greater are clearly predisposed to stress shielding, predominantly at the mid-shaftregion.Thursday, October 7, 2010, 14:20-15:00Session B6: Computer Navigation in TKR 2Effect of Total Knee Arthroplasty on Varus Knee Biomechanics DuringGait*Ajit Deshmukh - Lenox Hill Hospital - New York, USKarl Orishimo - Nicholas Institute For Sports Medicine And Athletic Trauma - New York, USAIan Kremenic - Nicholas Institute For Sports Medicine And Athletic Treauma - New York,USAMalachy McHugh - Nicholas Institute For Sports Medicine And Athletic Trauma - New York,USAStephen Nicholas - Nicholas Institute For Sports Medicine And Athletic Trauma - New York,USAJose Rodriguez - Lenox Hill Hospital - New York, USARaman Thakur - William Harvey Hospital - Ashford, UK*Email: drajitdeshmukh@gmail.comIntroduction: Although Total Knee Arthroplasty (TKA) has been shown to correct abnormalfrontal plane knee biomechanics, little is known about this effect beyond 6 months. The purposeof this study was to compare sequentially the knee adduction moment during level-walkingbefore and after TKA in varus knees. We hypothesized that adduction moment would diminishafter TKA proportionate to the tibio-femoral realignment in degrees.Methods: Fifteen patients (17 TKA’s) with varus knees were prospectively enrolled and gaitanalysis performed prior to, 6 months and 1 year following TKA. Reflective markers wereplaced on the lower extremity and motion data collected using six infrared cameras (Qtrac,Qualysis). Ground reaction forces were recorded with a multicomponent force plate (Kistler). Arepeated-measures ANOVA was used to compare changes in the peak adduction moment andfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]