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arthroplasty. Obesity is an appropriate indication for the use of computer navigation duringTKA where use of conventional techniques may result in significant limb and componentmalalignment.Thursday, October 7, 2010, 8:30-9:20Session B2: Knee Arthroplasty in the Indian Sub ContinentDeterminants of Limb Alignment After Minimally-Invasive Oxford MedialUnicompartmental Knee Arthroplasty*Gautam Shetty - Breach Candy Hospital - Mumbai, IndiaArun Mullaji - . - Mumbai, India*Email: aviswa1@its.jnj.comExcessive under correction of varus deformity may lead to early failure and overcorrection maycause progressive degeneration of the lateral compartment following medial unicompartmentalknee arthroplasty (UKA). However, what influences the postoperative limb alignment in UKAis still not clear. This study aimed to evaluate postoperative limb alignment in minimallyinvasiveOxford medial UKAs and the influence of factors such as preoperative limb alignment,insert thickness, age, BMI, gender and surgeon’s experience on postoperative limb alignment.Clinical and radiographic data of 122 consecutive minimally-invasive Oxford phase 3 medialunicompartmental knee arthroplasties (UKAs) performed in 109 patients by a single surgeonwas analysed. Ninety-four limbs had a preoperative hip-knee-ankle (HKA) angle between170°-180° and 28 limbs (23%) had a preoperative hip-knee-ankle (HKA) angle 3° of 177° and 11% of limbs were left overcorrected (>180°).Preoperative HKA angle had a strong correlation (r=0.53) with postoperative HKA anglewhereas insert thickness, age, BMI, gender and surgeon’s experience had no influence on thepostoperative limb alignment.Minimally invasive Oxford phase 3 UKA can restore the limb alignment within acceptablelimits in majority of cases. Preoperative limb alignment may be the only factor whichinfluences postoperative alignment in minimally-invasive Oxford medial UKAs. Although thedegree of correction achieved postoperatively from the preoperative deformity was greater inlimbs with more severe preoperative varus deformity, these knees tend to remain in more varusor under corrected postoperatively. Overcorrection was more in knees with lesser preoperativedeformity. Hence enough bone may need to be resected from the tibia in knees with lesserpreoperative deformity to avoid overcorrection whereas limbs with large preoperative varusdeformities may remain under corrected.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]