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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part H. Journal of Engineering in Medicine >Tribological property of the cobalt-chromium femoral head with different regions of wear in total hip arthroplasty
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Tribological property of the cobalt-chromium femoral head with different regions of wear in total hip arthroplasty

机译：全髋关节置换术中不同磨损区域钴铬合金股骨头的摩擦学特性

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摘要

The tribological properties of engineering and biological materials have been investigated at microscale levels through the calculation of the surface roughness and frictional coefficient using atomic force microscopy (AFM). Although a number of previous studies have reported the frictional coefficients of diverse bearing materials in total hip arthroplasty (THA), the relationship between the surface roughness and frictional coefficient of bearing materials of THA have not been reported, and furthermore, the tribological properties for different wear regions of a cobalt-chromium (Co-Cr) femoral head have not been well identified. Therefore, the objective of this study is to investigate the relationships between the surface roughness, frictional coefficient, and hardness for both the main-wear and the least-wear regions of a Co- Cr femoral head 10 years after THA. The average Vickers hardness of the Co-Cr femoral head was 380.7±11.3 HV. With the scanned area of 25 mm625 mm through AFM, the frictional coefficients of the main-wear and the least-wear regions were 0.229±0.054 and 0.243?0.059, respectively, and showed no statistical differences between these two regions (p50.449). However, differences in the surface roughness (R_q) between the main-wear region (R_q 596.5±26.2nm) and the least-wear region (R_q517.7±4.2 nm) were statistically significant (p,0.0001). The results of the current study suggest that the frictional property of the Co-Cr femoral head is not significantly correlated with its surface roughness, and also provide guidelines for improving the surface characteristics of metallic implant materials.
机译：通过使用原子力显微镜（AFM）计算表面粗糙度和摩擦系数，已在微观尺度上研究了工程和生物材料的摩擦学特性。尽管许多先前的研究已经报道了各种轴承材料在全髋关节置换术（THA）中的摩擦系数，但是尚未报道THA轴承材料的表面粗糙度和摩擦系数之间的关系，此外，对于不同的轴承材料，其摩擦学特性也不同。钴铬（Co-Cr）股骨头的磨损区域尚未明确。因此，本研究的目的是研究THA治疗10年后Co-Cr股骨头的主要磨损区域和最小磨损区域的表面粗糙度，摩擦系数和硬度之间的关系。 Co-Cr股骨头的平均维氏硬度为380.7±11.3 HV。在通过AFM进行的25 mm 625 mm扫描区域中，主要磨损区域和最小磨损区域的摩擦系数分别为0.229±0.054和0.243？0.059，这两个区域之间没有统计学差异（p50.449） 。然而，主磨损区（R_q 596.5±26.2nm）和最小磨损区（R_q517.7±4.2nm）之间的表面粗糙度（R_q）差异具有统计学意义（p，0.0001）。目前的研究结果表明，Co-Cr股骨头的摩擦特性与其表面粗糙度没有显着相关性，并且为改善金属植入物的表面特性提供了指导。

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