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首页> 外文会议>Leeds-Lyon Symposium on Tribology; 20000905-08; Lyon(FR) >Tribotesting of Tibial Bearings of Knee Prostheses
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Tribotesting of Tibial Bearings of Knee Prostheses

机译：膝关节假体胫骨轴承的摩擦测试

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摘要

Most of the tibial bearings for knee prostheses are made from ultra-high molecular weight polyethylene (UHMWPE). The longevity of those bearings is less than ten years in many cases, owing to tribological failure. In total knee replacements, the polymer bearings are subjected to oscillatory rolling/sliding contact; sliding wear and contact fatigue can both be important modes of knee bearing failure under these conditions. This research applied accelerated testing techniques to assess the tribological behavior of several different UHMWPE tibial bearing materials. Accelerated aging of bearing material was done to simulate, within a few weeks, the long-term changes that previously have been documented in joint prosthesis bearings in use for 5 to 10 years or more. Cyclic wear and contact fatigue tests were carried out using two tribotesters, a knee simulator and a rolling/sliding contact tester, in order to determine the performance of unaged and aged bearing material. The relative merits of both types of model experiments were examined in this test program. Gravimetric and volumetric methods for measuring wear accurately in the tests were also evaluated. A large, established archive of joint bearings explanted from patients was used to confirm that the surface failure mechanisms observed in the laboratory were similar to clinical wear mechanisms.
机译：大多数用于膝关节假体的胫骨轴承均由超高分子量聚乙烯（UHMWPE）制成。在许多情况下，由于摩擦学失效，这些轴承的寿命不到十年。在全膝关节置换术中，聚合物轴承会经受振荡的滚动/滑动接触；在这种情况下，滑动磨损和接触疲劳都是膝盖轴承失效的重要模式。这项研究应用加速测试技术来评估几种不同的UHMWPE胫骨轴承材料的摩擦学行为。轴承材料的加速老化可以在几周内模拟以前在使用5至10年或更长时间的关节假体轴承中已记录的长期变化。为了确定未老化和老化的轴承材料的性能，使用了两个三个学期，一个膝盖模拟器和一个滚动/滑动接触测试仪进行了循环磨损和接触疲劳测试。在此测试程序中检查了两种类型的模型实验的相对优点。还评估了用于在测试中准确测量磨损的重量和体积方法。使用从患者身上移植来的大量建立的关节轴承档案来确认实验室观察到的表面破坏机制与临床磨损机制相似。

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