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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part H. Journal of Engineering in Medicine >Effect of simplifications of bone and components inclination on the elastohydrodynamic lubrication modeling of metal-on-metal hip resurfacing prosthesis
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Effect of simplifications of bone and components inclination on the elastohydrodynamic lubrication modeling of metal-on-metal hip resurfacing prosthesis

机译：简化骨骼和组件倾斜度对金属对金属髋关节表面修复假体的弹性流体动力润滑建模的影响

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摘要

It is important to study the lubrication mechanism of metal-on-metal hip resurfacing prosthesis in order to understand its overall tribological performance, thereby minimize the wear particles. Previous elastohydrodynamic lubrication studies of metal-on-metal hip resurfacing prosthesis neglected the effects of the orientations of the cup and head. Simplified pelvic and femoral bone models were also adopted for the previous studies. These simplifications may lead to unrealistic predictions. For the first time, an elastohydrodynamic lubrication model was developed and solved for a full metal-onmetal hip resurfacing arthroplasty. The effects of the orientations of components and the realistic bones on the lubrication performance of metal-on-metal hip resurfacing prosthesis were investigated by comparing the full model with simplified models. It was found that the orientation of the head played a very important role in the prediction of pressure distributions and film profiles of the metal-on-metal hip resurfacing prosthesis. The inclination of the hemispherical cup up to 45° had no appreciable effect on the lubrication performance of the metal-on-metal hip resurfacing prosthesis. Moreover, the combined effect of material properties and structures of bones was negligible. Future studies should focus on higher inclination angles, smaller coverage angle and microseparation related to the occurrences of edge loading.
机译：研究金属对金属的髋关节置换假体的润滑机理，以了解其整体摩擦学性能，从而最大程度地减少磨损颗粒，非常重要。先前关于金属对金属髋关节表面修复假体的弹性流体动力润滑研究忽略了杯和头的方向的影响。先前的研究也采用了简化的骨盆和股骨模型。这些简化可能导致不切实际的预测。首次开发了弹性流体动力润滑模型，并对其进行了全金属-金属髋关节表面置换术的求解。通过将完整模型与简化模型进行比较，研究了部件的方向和逼真的骨骼对金属对金属髋关节表面修复假体润滑性能的影响。发现头部的方向在预测金属对金属髋关节表面修复假体的压力分布和薄膜轮廓方面起着非常重要的作用。半球形杯倾斜至45°不会对金属对金属髋关节表面修复假体的润滑性能产生明显影响。此外，骨骼的材料特性和结构的综合影响可忽略不计。未来的研究应该集中在与边缘载荷的发生有关的更大的倾斜角，更小的覆盖角和微观分离上。

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