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首页> 外文期刊>Journal of Biomechanics >Effect of swing phase load on metal-on-metal hip lubrication, friction and wear.
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Effect of swing phase load on metal-on-metal hip lubrication, friction and wear.

机译：摆相负荷对金属对金属髋部润滑，摩擦和磨损的影响。

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摘要

There is renewed interest in metal-on-metal (MOM) total hip replacements (THRs), however, variable wear rates have been observed clinically. It is hypothesised that changes in soft tissue tensioning during surgery may alter loading of THRs during the swing phase of gait leading to changes in fluid film lubrication, friction and wear. This study aimed to assess the effect of swing phase load on the lubrication, friction and wear of MOM hip replacements. Theoretical lubrication modelling was carried out using elastohydrodynamic theory. All the governing equations were solved numerically for the lubricant film thickness between the articulating surfaces under the transient dynamic conditions with low and high swing phase loads. Friction testing was completed using a single axis pendulum simulator, simplified loading cycles were applied with low and high swing phase loads. MOM hip replacements were tested in a hip simulator, modified to provide different swing phase loading regimes; a low (100 N) and a high load (as per ISO 14242-1; 280 N). Results demonstrated that the performance of MOM bearings is highly dependent on swing phase load. Hence, changes in the tension of the tissues at surgery and variations in muscle forces may increase swing phase load, reduce lubrication, increase friction and accelerate wear. This may explain some of the variations that have been observed with clinical wear rates.
机译：人们对金属对金属（MOM）的全髋关节置换术（THR）有了新的兴趣，但是，在临床上已观察到可变的磨损率。假设在手术期间软组织张力的变化可能会改变步态摆动阶段THR的负荷，从而导致液膜润滑，摩擦和磨损发生变化。这项研究旨在评估摆动相负荷对MOM髋关节置换物的润滑，摩擦和磨损的影响。理论润滑建模是使用弹性流体力学理论进行的。在瞬态动态条件下，无论是低摆动相位载荷还是高摆动相位载荷，都对铰接表面之间的润滑膜厚度进行了数值求解，从而解决了所有控制方程。摩擦测试是使用单轴摆锤模拟器完成的，在低和高摆相载荷下都应用了简化的载荷循环。 MOM髋关节置换术在髋关节模拟器中进行了测试，经过修改以提供不同的摆动阶段加载方式;低（100 N）和高负载（根据ISO 14242-1; 280 N）。结果表明，MOM轴承的性能高度依赖于摆动相载荷。因此，手术时组织张力的变化和肌肉力的变化可能会增加摆动相负荷，减少润滑，增加摩擦并加速磨损。这可以解释临床磨损率已观察到的一些变化。

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