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The Journal of Bone and Joint Surgery (American) 84:S129-S135 (2002)
© 2002 The Journal of Bone and Joint Surgery, Inc.

Scientific Exhibits

Polyethylene Wear Performance of Oxidized Zirconium and Cobalt-Chromium Knee Components Under Abrasive Conditions

Michael D. Ries, MD, Abraham Salehi, PhD, Kirstin Widding, MS and Gordon Hunter, PhD

The first 150 words of the full text of this article appear below.


   Introduction
 
The surfaces of retrieved cobalt-chromium (CoCr) total knee arthroplasty femoral components show evidence of roughening ( Fig. 1 ) 1-3 . In vitro studies have shown that scratches on the hard counterface, particularly those at an angle to the direction of motion, can increase wear of ultra-high molecular weight polyethylene 4-10 . An alternative material, oxidized zirconium (OxZr), was developed to provide an improvement over CoCr in resistance to roughening, frictional behavior, and biocompatibility 11-16 . Previous knee simulator testing under clean conditions (without intentional addition of abrasives) demonstrated that articulation with OxZr femoral components resulted in rates of wear of the ultra-high molecular weight polyethylene that were more than sixfold lower than those obtained with CoCr femoral components 17 . Because femoral components roughen clinically in a way that can increase wear of the ultra-high molecular weight polyethylene insert, simulator testing under abrasive conditions also was needed to better characterize the performance of . . . [Full Text of this Article]


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