DEGRADATION OF POLYETHYLENE JOINT COMPONENTS

这项研究的目的是确定以下因素的综合影响 铰链失效时的外加载荷和化学降解 超高相对分子质量聚乙烯全接缝表面 更换组件。将从三个方面进行研究：1)循环 在加载条件下，会导致机身及其下方的小缺陷 连接表面以传播和创建表面损伤模式 由疲劳断裂机制产生，观察到在取回 成分：2)发生化学降解的程度 聚乙烯接头成分随化学环境和环境的变化 加载历史；3)化学降解对表面的影响 疲劳断裂机制产生的损伤模式。这些研究 将建立对综合化学品的全面了解， 共用聚乙烯的力学和结构性能 关节置换。我们的目标是使长期业绩最大化 聚乙烯连接件。

The purpose of this research is to establish the combined effects of applied load and chemical degradation on failure of articulating surfaces of ultra high molecular weight polyethylene total joint replacement components. Three areas will be studied: 1) the cyclic loading conditions which will cause small defects on and below the articulating surface to propagate and create the surface damage modes generated by fatigue fracture mechanisms observed on retrieved components: 2) the extent of chemical degradation occurring to polyethylene joint components as a function of chemical environment and loading history; and 3) the effect of chemical degradation on surface damage modes generated by fatigue fracture mechanisms. These studies will establish a comprehensive understanding of the integrated chemical, mechanical and structural behavior of polyethylene as used in total joint replacements. The goal is to maximize the long-term performance of polyethylene joint components.