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Quantifying Deformation and Recovery of Polyethylene in Total Knee Replacement

机译：量化全膝关节置换中聚乙烯的变形和恢复

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Polyethylene exhibited large deformations under these loading conditions, demonstrating the need to account for deformation if volumetric analysis is used to quantify wear. Also deformation recovery should also be considered, allowing ample time to achieve steady state. Linear elastic theory may not be valid in this range of loading as evidenced by the disagreement with contact area results (Figure 1) as well as estimated stresses (30+ MPa) that exceed yield even at relatively low applied loads. Contact profilometry and laser scanning methods showed good agreement with each other, especially for maximum deformation. Their agreement with theory is misleading, because the measurements were taken 5-15 minutes after the load was removed and likely under-predict the loaded deformation. Investigators using volumetric wear methods and radiostereographic analysis should take care to understand the contribution of deformation and specifically the viscoelastic and plastic behavior of polyethylene in Hertzian contact.
机译：在这些载荷条件下，聚乙烯表现出较大的变形，这表明如果使用体积分析来量化磨损，则需要考虑变形。另外，还应考虑变形恢复，从而留出足够的时间达到稳态。线性弹性理论在此载荷范围内可能无效，这是通过与接触面积结果（图1）以及估计应力（30+ MPa）的不同证明的，即使在相对较低的施加载荷下，应力也超过屈服。接触轮廓仪和激光扫描方法显示出良好的一致性，尤其是最大程度的变形。他们与理论的一致性具有误导性，因为测量是在去除载荷后5到15分钟进行的，并且可能低估了载荷变形。使用体积磨损方法和放射线照相分析的研究人员应注意了解形变的贡献，特别是聚乙烯在赫兹接触中的粘弹性和塑性行为。

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