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首页> 外文期刊>Acta biomaterialia >The relative effects of radiation crosslinking and type of counterface on the wear resistance of ultrahigh-molecular-weight polyethylene.
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The relative effects of radiation crosslinking and type of counterface on the wear resistance of ultrahigh-molecular-weight polyethylene.

机译：辐射交联和对接面类型对超高分子量聚乙烯耐磨性的相对影响。

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摘要

The lifetime of total joint replacement prostheses utilizing ultrahigh-molecular-weight polyethylene (UHMWPE) components has historically been determined by their wear resistance. It has been discovered that radiation crosslinking of UHMWPE can substantially increase its wear resistance. However, it is also well recognized that there is a radiation-dose-dependent decrease in several important mechanical properties of UHMWPE, such as fracture toughness and resistance to fatigue crack propagation. In this study, the effect of radiation crosslinking (followed by remelting) on the morphology, tensile properties and wear resistance of UHMWPE was investigated. Wear tests were conducted against both the commonly used cobalt-chromium counterface polished to implant grade smoothness as well as a smoother ceramic (alumina) counterface. The results showed that 50kGy dose radiation crosslinking increased the wear resistance of UHMWPE against the cobalt-chromium counterface 7-fold, but the coupling of remelted, crosslinked UHMWPE against the smoother alumina counterface led to a 20-fold increase in wear resistance. This study shows that the use of an alumina counterface would circumvent the need to use a high radiation dose in crosslinking UHMWPE, associated with poor mechanical properties, without compromising wear resistance.
机译：历史上，使用超高分子量聚乙烯（UHMWPE）组件进行的全关节置换假体的使用寿命由其耐磨性决定。已经发现UHMWPE的辐射交联可以显着提高其耐磨性。但是，也众所周知，UHMWPE的几个重要机械性能（如断裂韧性和抗疲劳裂纹扩展性）的辐射剂量依赖性降低。在这项研究中，研究了辐射交联（随后重熔）对UHMWPE的形貌，拉伸性能和耐磨性的影响。对常用的抛光至植入级平滑度的钴铬合金对接面以及较光滑的陶瓷（氧化铝）对接面进行了磨损测试。结果表明，50kGy剂量的辐射交联使UHMWPE对钴-铬对接面的耐磨性提高了7倍，但重熔交联的UHMWPE对较光滑的氧化铝对接面的偶联使耐磨性提高了20倍。这项研究表明，使用氧化铝对接面可避免在交联UHMWPE中使用高辐射剂量，而机械性能差，同时又不影响耐磨性。

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