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mean Harris hip score was 98 points (80-99). X-rays showed good bone-implant contactwithout any osteolysis or bone rarefaction.A detailed review of the clinical data of these patients shows that a PCU liner inserted into aCo-Cr acetabular shell is as safe and effective as other commonly used acetabular shells in othertotal hip systems currently available. No new or unintended adverse or device-related eventswere discovered with the clinical use of PCU in a Co-Cr acetabular shell.Friday, October 8, 2010, 10:20-11:00Session A12: MaterialsLong-Term Wear Performance of an Advanced Bearing Knee TechnologyIntroduction:*Ramprasad Papannagari - Smith & Nephew, Inc. - Memphis, USAGary Hines - Smith & Nephew, Inc - Memphis, USAJeff Sprague - Smith & Nephew, Inc. - Memphis, USAMark Morrison - Smith & Nephew Orthopaedics - Memphis, USA*Email: ramprasad.papannagari@smith-nephew.comThe most common bearing couple used in total knee arthroplasty (TKA) is ultra-high molecularweight polyethylene (UHMWPE) articulating against a CoCrMo alloy femoral component.Although this couple has demonstrated good clinical results, UHMWPE wear has beenidentified as one of the principal causes for long-term failure of total knee joint replacements 1indicating a need for improvements in TKA bearings technology.The wear resistance of UHMWPE can be improved by radiation crosslinking; however, in orderto get the full benefit of this improved wear resistance, an abrasion resistant ceramiccounterface is necessary. 2 Since the radiation crosslinking degrades mechanical properties, it isalso important to have an optimized radiation dose and subsequent processing. The purpose ofthis study was to evaluate the long-term wear performance of VERILAST Technologycomprising two advanced bearing technologies, abrasion resistant OXINIUM femoralcomponents (OxZr) 3-4 and wear/strength optimized 7.5 Mrad crosslinked polyethylene (7.5-XLPE). 5file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]