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首页> 外文期刊>Journal of Biomechanics >Material and surface factors influencing backside fretting wear in total knee replacement tibial components.
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Material and surface factors influencing backside fretting wear in total knee replacement tibial components.

机译：影响全膝关节置换胫骨组件后侧微动磨损的材料和表面因素。

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摘要

Retrieval studies have shown that the interface between the ultra-high molecular weight polyethylene insert and metal tibial tray of fixed-bearing total knee replacement components can be a source of substantial amounts of wear debris due to fretting micromotion. We assessed fretting wear of polyethylene against metal as a function of metal surface finish, alloy, and micromotion amplitude, using a three-station pin-on-disc fretting wear simulator. Overall, the greatest reduction in polyethylene wear was achieved by highly polishing the metal surface. For example, highly polished titanium alloy surfaces produced nearly 20 times less polyethylene wear compared with blasted titanium alloy, whereas, decreasing the micromotion amplitude from 200 to 50microm produced approximately four times less polyethylene wear for the same blasted titanium alloy surface. Although the effect of the metal alloy was much smaller than the effect of metal surface roughness or the micromotion amplitude, CoCr discs produced slightly greater polyethylene fretting wear than titanium alloy discs under each condition. The results are essential in design and manufacturing decisions related to fixed-bearing total knee replacements.
机译：检索研究表明，由于微动微动，超高分子量聚乙烯插入物与固定支撑全膝关节置换组件的金属胫骨托之间的界面可能是大量磨损碎片的来源。我们使用三工位针式圆盘微动磨损模拟器评估了聚乙烯对金属的微动磨损与金属表面光洁度，合金和微动幅度的关系。总体而言，通过高度抛光金属表面可以最大程度地减少聚乙烯的磨损。例如，高度抛光的钛合金表面产生的聚乙烯磨损是喷砂钛合金的近20倍，而将微运动幅度从200微米降低到50微米，则对于相同的喷砂钛合金表面产生的聚乙烯磨损约低四倍。尽管金属合金的影响远小于金属表面粗糙度或微动幅度的影响，但在每种情况下，CoCr盘所产生的聚乙烯微动磨损都比钛合金盘稍大。结果对于固定轴承全膝关节置换的设计和制造决策至关重要。

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