Wear of Polyethylene Against Oxidized Zirconium Femoral Components: Effect of Aggressive Kinematic Conditions and Malalignment in Total Knee Arthroplasty
Section snippets
Methods
Three oxidized zirconium Profix (Smith & Nephew, Memphis, Tenn) femoral components and 3 femoral components (Fig. 1) of identical geometry made of an alloy of cobalt-chrome-molybdenum (Co-Cr) were mounted in a 6-station displacement-controlled knee wear simulator (AMTI, Watertown, Mass). The femoral components were articulated against 6 tibial PE inserts (non–cross-linked, sterilized by ethylene oxide) in modular tibial base plates. The lubricant used was 90% bovine serum supplemented with EDTA
Results
Oxidized zirconium femoral components reduced PE wear by 55% compared with cobalt-chrome components under conditions of varus malalignment and excessive tibiofemoral rotations (Table 1). Mean gravimetric wear rate was very linear (R2 > 0.99) over 5 million cycles and consistently lower in the oxidized zirconium group (Fig. 3). Volumetric wear calculated from the surface mapping technique showed similar but slightly lower overall wear rates, as compared with the gravimetric measurements between
Discussion
In a previous study of the same material and component design at our laboratory, it was shown that tibial PE wear was substantially reduced when oxidized zirconium femoral components were used under so-called benign testing conditions (based on ISO standards) [21]. Compared with our previous study, we found that increased tibial rotation together with increased medial loading almost doubled the wear in the cobalt-chrome groups (20-39 mg per million cycles). The wear rate also increased in the
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2020, Journal of the Mechanical Behavior of Biomedical MaterialsCitation Excerpt :The volumetric wear rate [7.16 ± 1.9 mm3/million cycles (Mc)] of CPE against the laser-sintered Co–28Cr–6Mo femoral component was smaller than that of the CPEs against cast Co–28Cr–6Mo alloy (15.1 ± 1.2 mm3/Mc) and oxidized Zr (11.0 ± 2.1 mm3/Mc) femoral components. The volumetric wear rates (displacement control) of the CPEs against cast Co–28Cr–6Mo alloy and oxidized femoral components reported in the literature are 22.4 ± 1.4 (Ezzet et al., 2004; Morrison et al., 2015) and 14.2 ± 2.1 mm3/Mc (Ezzet et al., 2004, 2012; Morrison et al., 2015), respectively. Also, the volumetric wear rates of CPEs obtained by knee joint simulator (displacement control) tests using Nexgen CR and PFC Sigma CR TKAs are 18.4 ± 3.8 (Haider et al., 2002; Johnson et al., 2003; Schaerer et al., 2010; Popoola et al., 2010; Micheli et al., 2012) and 19.8 ± 3.9 mm3/Mc (Barnett et al., 2001; Fisher et al., 2001; McEwen et al., 2001, 2005; Galvin et al., 2009; O'Brien et al., 2015) in the literature, respectively.
The Conflict of Interest statement associated with this article can be found at doi:10.1016/j.arth.2011.06.002.
This study was funded with research support from Smith & Nephew.