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首页> 美国卫生研究院文献>Elsevier Sponsored Documents >Influence of contact pressure cross-shear and counterface material on the wear of PEEK and CFR-PEEK for orthopaedic applications
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Influence of contact pressure cross-shear and counterface material on the wear of PEEK and CFR-PEEK for orthopaedic applications

机译：接触压力交叉剪切和对接材料对整形外科应用PEEK和CFR-PEEK磨损的影响

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Total joint replacement is a successful surgical intervention for the treatment of the degeneration of many joints, particularly the hip and knee. As the demand for joint replacement grows, and the life expectancy of the population increases, the performance requirements of these implants also changes. New materials, to improve longevity and enhance performance have been explored including PEEK and CFR-PEEK.This study investigated whether CFR-PEEK and PEEK were appropriate materials for total joint replacement by examining wear performance in simple configuration studies articulating against cobalt chrome under a range of cross-shear and contact pressure conditions. Simple geometry pin on plate studies were conducted for one million cycles for each test condition, with the contact pressure and cross-shear conditions representing a range in which the material may need to operate in-vivo.The wear factor for PEEK was significantly higher than CFR-PEEK and conventional polyethylene under all test conditions. Both PEEK and CFR-PEEK wear were influenced by contact pressure, with the highest wear factors for both materials measured at the highest pressure conditions. PEEK appeared to have a cross-shear dependent wear response, but this was not observed for the CFR-PEEK material.This study has further characterised the wear performance of two materials that are gaining interest for total joint replacement. The wear performance of the PEEK material showed poorer wear performance compared to polyethylene when articulating with a metal counterface, but the performance of the CFR-PEEK material suggested it may provide a suitable alternative to polyethylene in some applications. The wear performance of CFR-PEEK was poorer than polyethylene when it was used as the plate, when there was translation of the contact zone over the surface of the CFR-PEEK plate. This has implications for applications in low conforming contacts, such as lower conformity knee replacement.
机译：全关节置换术是一种成功的外科手术，可用于治疗许多关节，尤其是髋关节和膝关节的退化。随着对关节置换的需求的增长，以及人口预期寿命的增加，这些植入物的性能要求也随之变化。探索了提高使用寿命和提高性能的新材料，包括PEEK和CFR-PEEK。这项研究通过在简单配置研究中研究了钴铬合金在一定范围内的磨损性能，研究了CFR-PEEK和PEEK是否是全接头置换的合适材料。交叉剪切和接触压力条件。对于每种测试条件，简单的几何销钉板上的研究进行了100万次循环，接触压力和交叉剪切条件代表了材料可能需要在体内进行操作的范围.PEEK的磨损系数明显高于在所有测试条件下均采用CFR-PEEK和常规聚乙烯。 PEEK和CFR-PEEK的磨损均受接触压力的影响，两种材料的最高磨损系数均在最高压力条件下测得。 PEEK似乎具有交叉剪切相关的磨损响应，但对于CFR-PEEK材料却没有观察到。这项研究进一步表征了两种材料的磨损性能，这些材料引起了全关节置换的兴趣。当与金属对接件铰接时，与聚乙烯相比，PEEK材料的耐磨性能较聚乙烯差，但CFR-PEEK材料的性能表明，它可以在某些应用中替代聚乙烯。当CFR-PEEK板用作接触板时，当CFR-PEEK板表面上的接触区域发生平移时，其耐磨性能比聚乙烯差。这对于低适应性接触中的应用具有影响，例如较低适应性的膝关节置换。

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