Center for Tribology, School of Mechatronic Engineering, Jiangsu Normal University, Xuzhou, Jiangsu Province, China.
J Biomater Appl. 2023 May;37(10):1736-1757. doi: 10.1177/08853282231163678. Epub 2023 Mar 16.
In order to investigate the effect of frictional heat on the wear resistance characteristics of polymeric acetabular materials, the tribological tests and wear numerical analysis of three common polymer acetabular materials were carried out under different synovial fluid temperatures. The study results show that XLPE and VE-XLPE exhibit superior wear resistance compared to UHMWPE in high-temperature, heavy load environments. The coefficient of friction of three materials gradually decreases as the temperature of the synovial fluid increases. The wear depth and wear volume of the three materials increased with the increase of the temperature of the synovial fluid, and the forms of wear at 46°C and 55°C were mainly adhesive wear and plastic deformation. The higher temperature of the synovial fluid accelerates the oxidative degradation of the material surface and generates oxidation functional groups, which leads to the breakage of C-C bonds in the surface molecular chains under the sliding shear effect, thus reducing the mechanical properties of the material. Specifically, the surface of the polymer material will soften at a higher ambient temperature, mainly due to the decrease of hardness, and then deteriorate in the friction property, and finally increase the wear rate. Ansys results showed that the volume wear of the three materials increased with the increase of synovial fluid temperature, and the trend could be approximately linear. Numerical calculations predict that VE-XLPE has the highest wear of 0.693 mm among the three materials at 37°C, followed by XLPE at 0.568 mm and UHMWPE with the lowest wear of 0.478 mm. At higher synovial fluid temperatures (46°C, 55°C), VE-XLPE still has the largest wear volume among the three materials, while XLPE and UHMWPE have similar wear. The wear cloud pictures showed that the maximum wear volume occurred near the edge of the acetabulum.
为了研究摩擦热对聚合物髋臼材料耐磨性的影响，在不同关节滑液温度下对三种常见聚合物髋臼材料进行了摩擦学试验和磨损数值分析。研究结果表明，XLPE 和 VE-XLPE 在高温、重载环境下表现出比 UHMWPE 更好的耐磨性。三种材料的摩擦系数随着关节滑液温度的升高而逐渐降低。三种材料的磨损深度和磨损体积随着关节滑液温度的升高而增加，在 46°C 和 55°C 下的磨损形式主要为粘着磨损和塑性变形。较高的关节滑液温度加速了材料表面的氧化降解，并产生氧化官能团，在滑动剪切作用下导致表面分子链中的 C-C 键断裂，从而降低了材料的力学性能。具体来说，聚合物材料的表面在较高的环境温度下会软化，主要是由于硬度降低，然后在摩擦性能方面恶化，最终增加磨损率。Ansys 结果表明，三种材料的体积磨损随关节滑液温度的升高而增加，趋势大致呈线性。数值计算预测，在 37°C 时，三种材料中 VE-XLPE 的磨损量最高，为 0.693mm，其次是 XLPE，为 0.568mm，UHMWPE 的磨损量最低，为 0.478mm。在较高的关节滑液温度（46°C、55°C）下，VE-XLPE 仍然是三种材料中磨损量最大的，而 XLPE 和 UHMWPE 的磨损量相似。磨损云图显示，最大磨损量出现在髋臼边缘附近。
