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Enhanced lubricant film formation through micro-dimpled hard-on-hard artificial hip joint: An in-situ observation of dimple shape effects
Journal of the Mechanical Behavior of Biomedical Materials ( IF 3.3 ) Pub Date : 2018-02-17 , DOI: 10.1016/j.jmbbm.2018.02.014
Dipankar Choudhury , David Rebenda , Shinya Sasaki , Pavel Hekrle , Martin Vrbka , Min Zou

This study evaluates the impact of dimple shapes on lubricant film formation in artificial hip joints. Micro-dimples with 20–50 µm lateral size and 1 ± 0.2 µm depths were fabricated on CrCoMo hip joint femoral heads using a picosecond laser. Tribological studies were performed using a pendulum hip joint simulator to apply continuous swing flexion–extension motions. The results revealed a significantly enhanced lubricant film thickness (≥ 500 nm) with micro-dimpled prosthesis heads at equilibrium position after the lubricant film has fully developed. The average lubricant film thickness of dimpled prostheses with square- and triangular-shaped dimple arrays over time is about 3.5 that of the non-dimpled prosthesis (204 nm). Remarkably, the prosthesis with square-shaped dimple arrays showed a very fast lubricant film formation reaching their peak values within 0.5 s of pendulum movement, followed by prosthesis with triangular-shaped dimple arrays with a transition period of 42.4 s. The fully developed lubricant film thicknesses (≥ 700 nm) are significantly higher than the surface roughness (≈ 25 nm) demonstrating a hydrodynamic lubrication. Hardly any scratches appeared on the post-experimental prosthesis with square-shaped dimple array and only a few scratches were found on the post-experimental prosthesis with triangular-shaped dimple arrays. Thus, prostheses with square-shaped dimple arrays could be a potential solution for durable artificial hip joints.



中文翻译:

通过微凹痕硬对硬人工髋关节增强润滑膜形成:凹痕形状效应的原位观察

这项研究评估了酒窝形状对人工髋关节中润滑膜形成的影响。使用皮秒激光在CrCoMo髋关节股骨头上制造出横向尺寸为20–50 µm,深度为1±0.2 µm的微酒窝。摩擦学研究使用摆式髋关节模拟器进行连续的挥杆屈伸运动。结果表明,在润滑膜完全显影后,微凹假体头部处于平衡位置时,润滑膜厚度显着增加(≥500 nm)。具有方形和三角形凹痕阵列的带凹痕的假体随时间的平均润滑膜厚度约为非凹痕假体(204 nm)的3.5倍。值得注意的是 带有方形酒窝阵列的假体显示出非常快的润滑膜形成,其在摆运动的0.5 s内达到峰值,随后是带有三角形酒窝阵列的假体,其过渡时间为42.4 s。完全显影的润滑剂膜厚度(≥700 nm)明显高于表面粗糙度(≈25 nm),这说明了流体动力润滑。在带有方形酒窝阵列的实验后假体上几乎没有出现任何划痕,而在带有三角形酒窝阵列的实验后假体上几乎没有发现任何划痕。因此,具有方形凹痕阵列的假体可能是耐用的人工髋关节的潜在解决方案。其次是假体,其过渡周期为42.4 s的三角形凹窝阵列。完全显影的润滑剂膜厚度(≥700 nm)明显高于表面粗糙度(≈25 nm),这说明了流体动力润滑。在带有方形酒窝阵列的实验后假体上几乎没有出现任何划痕,而在带有三角形酒窝阵列的实验后假体上几乎没有发现任何划痕。因此,具有方形凹痕阵列的假体可能是耐用的人工髋关节的潜在解决方案。然后是假体,其过渡周期为42.4 s的三角形凹窝阵列。完全显影的润滑剂膜厚度(≥700 nm)明显高于表面粗糙度(≈25 nm),这说明了流体动力润滑。在带有方形酒窝阵列的实验后假体上几乎没有出现任何划痕,而在带有三角形酒窝阵列的实验后假体上几乎没有发现任何划痕。因此,具有方形凹痕阵列的假体可能是耐用的人工髋关节的潜在解决方案。在带有方形酒窝阵列的实验后假体上几乎没有出现任何划痕,而在带有三角形酒窝阵列的实验后假体上几乎没有发现任何划痕。因此,具有方形凹痕阵列的假体可能是耐用的人工髋关节的潜在解决方案。在带有方形酒窝阵列的实验后假体上几乎没有出现任何划痕,而在带有三角形酒窝阵列的实验后假体上几乎没有发现任何划痕。因此,具有方形凹痕阵列的假体可能是耐用的人工髋关节的潜在解决方案。

更新日期:2018-02-17
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