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0.04).Discussion:Although large diameter heads offer biomechanical advantages, their use in total hiparthroplasty has historically been limited due to correlation with increased polyethylene wear.While highly crosslinked liners exhibit significantly improved wear resistance overconventional UHWMPE, their wear has also been shown to increase with head size [1]. Resultspresented here indicate that this increase in wear can be negated by using OxZr, rather thanCoCr. Specifically, wear of XLPE liners was lower against 44 mm OxZr heads than against 36mm CoCr heads.References:1. Lachiewicz et al, Clin Orthop Relat Res, 467(2), 2009:3290–32962. Parikh et al, Trans ORS 2009:23403. Bergmann et al, J Biomech, 26(8), 1993:969-990FiguresFriday, October 8, 2010, 8:40-9:30Session A11: Knee Arthroplasty in the Middle EastNew Concept in Soft Tissue Balancing During Primary Total KneeArthroplasty*Ataollah Moshirabadi - National Iranian Oil Company(NIOC) Hospital - Tehran, Iran*Email: atamoshirabadi@yahoo.comNew concept in soft tissue balancing during primary total knee arthroplastyAtaollah Moshirabadi , MD.Consultant Orthopedic surgeon in Hip & Knee surgeryNIOC Hospital, TehranBackground:Performing total knee replacement needs both bony & soft tissue consideration. Late John Insalladvocating spacer blocks with concept of balanced & equal flexion – extension Gap. Althoughfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]