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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part H. Journal of Engineering in Medicine >Wear of surface-engineered metal-onmetal bearings for hip prostheses under adverse conditions with the head loading on the rim of the cup
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Wear of surface-engineered metal-onmetal bearings for hip prostheses under adverse conditions with the head loading on the rim of the cup

机译：在不利条件下，髋关节假体采用表面工程化的金属对金属轴承的磨损，头部载荷在杯缘上

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Clinical studies have found high wear rates, elevated ion levels and high revision rates of large-diameter metal-on-metal surface replacement bearings in some patients, which have been associated with edge loading of the head on the rim of the cup. We have simulated increased wear and ion levels in metal-on-metal bearings in vitro by introducing variations in translational and rotational positioning of the components, which reproduces stripe wear on the femoral head, cup rim wear and clinically relevant large as well as small wear particles. There is interest in technologies such as surface engineering, which might reduce metal wear and the release of wear particles and ions. Reduced wear with surfaceengineered surface replacements compared to metal-on-metal controls has been reported under standard walking conditions with correctly aligned and concentric components. In this in vitro study, the wear of chromium nitride surfaceengineered metal-on-metal bearings under conditions of microseparation associated with translational and rotational malpositioning of the components was investigated and the results were compared with a previously reported study of metal-on-metal bearings under the same conditions. Simulations were conducted using our unique hip simulation microseparation methodologies, which reproduce accelerated wear in metal-on-metal bearings and have previously been clinically validated with ceramic-on-ceramic bearings. Four of the six surface-engineered bearings had evidence of head contact on the rim of the cup, which produced stripe wear on the femoral head. Four of the six surface-engineered bearings (two without stripe and two with stripe wear) had lower wear than the previously reported high wearing metal-on-metal bearings. At 2 million cycles, two of the surface-engineered bearings had substantially increased wear rates, four times higher than the high wear rates previously reported for metal-on-metal bearings under the same conditions. There was wear through and cohesive failure of the thick atomic emission physical vapour deposition (AEPVD) chromium nitride (CrN) coating. At this point, the study was stopped to investigate the failure mode. This study highlights the need to pre-clinically investigate the tribology of new bearings under a wide set of clinical conditions as demonstrated by our stratified approach for enhanced reliability (SAFER) simulation methods. In adopting this SAFER approach to pre-clinical simulation testing of new bearings, it is important to communicate the failures as well as successes of technologies arising from the research, in order that the wider community can benefit from the analysis of the pre-clinical failure modes.
机译：临床研究发现，在某些患者中，大直径金属对金属表面替换轴承的磨损率高，离子水平高，修整率高，这与杯子边缘上的头部边缘负荷有关。我们通过引入组件的平移和旋转位置变化来模拟体外金属对金属轴承中增加的磨损和离子水平，从而再现股骨头上的条纹磨损，杯缘磨损以及临床上相关的大小磨损粒子。人们对诸如表面工程等技术感兴趣，这些技术可以减少金属磨损以及磨损颗粒和离子的释放。据报道，在标准行走条件下使用正确对准和同心的组件，与金属对金属控件相比，采用表面工程表面替换技术可减少磨损。在这项体外研究中，研究了与零件平移和旋转错位相关的微分离条件下氮化铬表面工程金属对金属轴承的磨损，并将结果与​​先前报道的金属对金属轴承研究进行了比较在相同条件下。使用我们独特的髋关节模拟微分离方法进行了模拟，该方法可重现金属对金属轴承中的加速磨损，并且先前已通过陶瓷对陶瓷轴承进行了临床验证。六个表面工程轴承中的四个有证据表明头部与杯的边缘接触，从而在股骨头上产生条纹磨损。与以前报道的高磨损金属对金属轴承相比，六个表面工程轴承中的四个（两个无条纹，两个具有条纹磨损）具有更低的磨损。在200万次循环中，两个表面工程轴承的磨损率大大提高，比以前报道的相同条件下金属对金属轴承的高磨损率高四倍。厚原子发射物理气相沉积（AEPVD）氮化铬（CrN）涂层出现磨损和内聚破坏。在这一点上，停止研究以调查失败模式。这项研究强调了在广泛的临床条件下对新轴承的摩擦学进行临床研究的必要性，正如我们的增强可靠性分层方法（SAFER）模拟方法所证明的那样。在采用这种SAFER方法进行新轴承的临床前模拟测试时，重要的是要交流研究产生的技术的失败与成功，以使更广泛的社区可以从临床前失败的分析中受益。模式。

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