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首页> 外文期刊>Acta biomaterialia >Determination of the temperature rise within UHMWPE tibial components during tribological loading.
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Determination of the temperature rise within UHMWPE tibial components during tribological loading.

机译：摩擦载荷期间UHMWPE胫骨组分内温度升高的测定。

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摘要

The wear of ultrahigh molecular weight polyethylene (UHMWPE) is considered as one of the major reasons for revision of artificial joints. While in vivo measurements have shown a significant temperature increase in knee implants, the amount of heat dissipated within the UHMWPE tibial component and its influence on the friction behavior when paired with a cobalt-chromium (CoCrMo) femoral component is unknown. Our goal was to address these questions by measuring the temperature rise over a wide range of tribological loading conditions that mimic certain spots on artificial knee joints. The temperature rise as a function of lubricant, sliding velocity, coefficient of friction and maximum load was determined and analyzed. Additionally, the heat gradient during constant loading was investigated that allows the calculation of heat flow. The test setup consists of a wheel-on-flat laboratory testing device. Tests were performed in ambient air and different lubricants. During the tests, the temperature rise in the polyethylene was recorded with embedded thermocouples. The temperature rise was high and shown to be directly linked to load, coefficient of friction and relative velocity. Because it is generally assumed that the applied energy is an indicator for the development of wear in particles, some considerations for the design of knee joints are proposed based on our observations. The amount of heat dissipated in the polyethylene under cyclic loading was measured and is discussed in comparison with the theoretical model of temperature in friction pairs.
机译：超高分子量聚乙烯（UHMWPE）的磨损被认为是修改人工关节的主要原因之一。虽然在体内测量中显示出膝关节植入物的显着温度升高，但是在与钴 - 铬（COCRMO）股骨成分配对时UHMWPE胫骨组分内散发的热量及其对摩擦行为的影响是未知的。我们的目标是通过测量在各种摩擦负载条件下的温度升高来解决这些问题，这些摩擦负载条件模仿人造膝关节上的某些斑点。确定和分析作为润滑剂，滑动速度，摩擦系数和最大载荷的函数的温度升高。另外，研究了恒定负载期间的热梯度，允许计算热流。测试设置包括一个平面实验室检测装置。在环境空气和不同的润滑剂中进行测试。在测试期间，用嵌入的热电偶记录聚乙烯中的温度升高。温度升高高，并且显示直接连接到负载，摩擦系数和相对速度。因为通常假设所应用的能量是用于在粒子中磨损开发的指示器，所以基于我们的观察，提出了对膝关节设计的一些考虑因素。测量在聚乙烯下在环状载荷下散发的热量，并与摩擦对温度的理论模型相比讨论。

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