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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part H. Journal of Engineering in Medicine >Importance of head diameter, clearance, and cup wall thickness in elastohydrodynamic lubrication analysis of metal-on-metal hip resurfacing prostheses
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Importance of head diameter, clearance, and cup wall thickness in elastohydrodynamic lubrication analysis of metal-on-metal hip resurfacing prostheses

机译：头部直径，间隙和杯壁厚度在金属对金属髋关节表面修复体的弹性流体动力润滑分析中的重要性

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摘要

The main design features of metal-on-metal (MOM) hip resurfacing prostheses in promoting elastohydrodynamic lubrication were investigated in the present study, including the femoral head diameter, the clearance, and the cup wall thickness. Simplified conceptual models were developed, based on equivalent uniform wall thicknesses for both the cup and the head as well as the support materials representing bone and cement, and subsequently used for elastohydrodynamic lubrication analysis. Both typical first- and second-generation MOM hip resurfacing prostheses with different clearances and cup wall thicknesses were considered with a fixed large bearing diameter of 50 mm, as well as a 28 mm diameter MOM total hip replacement bearing for the purpose of comparison. The importance of the head diameter and the clearance in promoting elastohydrodynamic lubrication was confirmed. Furthermore, it was also predicted that a relatively thin acetabular cup in the more recently introduced second-generation MOM hip resurfacing prostheses would be capable of improving elastohydrodynamic lubrication even further.
机译：本研究研究了金属对金属（MOM）髋关节表面修复假体在促进弹性流体动力润滑方面的主要设计特征，包括股骨头直径，间隙和杯壁厚度。基于杯子和头部的等效均匀壁厚以及代表骨骼和水泥的支撑材料，开发了简化的概念模型，随后将其用于弹性流体动力润滑分析。为了比较，考虑将具有不同间隙和杯壁厚度的典型第一代和第二代MOM髋关节表面修复假体固定为50 mm的固定大直径直径和28 mm直径的MOM全髋关节置换轴承。确认了头部直径和间隙对促进弹性流体动力润滑的重要性。此外，还可以预测，在最近推出的第二代MOM髋关节表面修复假体中，相对较薄的髋​​臼杯将能够进一步改善弹性流体动力润滑。

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