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首页> 外文会议>Society for Biomaterials Transaction of the 31st Annual Meeting vol.XXIX pt.2 >The Effect of Surface Finish on Micro Rotation and Frictional Torque of Taper-Locked Femoral Stems in Cemented Hip Joint Replacements
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The Effect of Surface Finish on Micro Rotation and Frictional Torque of Taper-Locked Femoral Stems in Cemented Hip Joint Replacements

机译：骨水泥髋关节置换中锥面锁定股骨柄的表面光洁度对微旋转和摩擦扭矩的影响

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摘要

A number of designs of femoral stems have used taper locking to achieve long-term stability in clinical use (1-3). Several studies have reported excellent clinical performance for tapered stems with a polished surface, but a higher rate of failure for those with a matte-finished surface (1.2), a difference that has been attributed, in part, to wear caused by micromotion at the stem-cement interface (4). In a previous study, we used a finite element model (FEA) to show that, even for a well taper-locked stem, some axial micromotion occurs under cyclic load, and the magnitude of the micromotion of a matte-finished stem may be comparable to that for a polished stem (5). In the present study, we addressed the question of whether, for a well taper-locked femoral stem, there is sufficient friction between the stem and the cement to prevent rotational micromotion, and, if not. how the magnitudes of the rotational micromotion and frictional torque are affected by the surface finish of the stem. These questions were assessed using an FEA model based on the Exeter stem, which features a straight, collarless, double-tapered shape.
机译：多种股骨柄设计已采用锥度锁定以在临床应用中获得长期稳定性（1-3）。几项研究报告了具有抛光表面的锥形杆的出色临床性能，但具有亚光表面的锥形杆的故障率更高（1.2），这种差异部分归因于在运动时微动所引起的磨损。水泥基界面（4）。在先前的研究中，我们使用了有限元模型（FEA）来表明，即使对于锥形锁紧的阀杆，在循环载荷下也会发生一些轴向微动，而磨砂杆的微动幅度可能是可比的到抛光杆的硬度（5）。在本研究中，我们解决了一个问题，即对于锥形锁定良好的股骨柄而言，该柄与骨水泥之间是否有足够的摩擦力来防止旋转微动，如果没有，那么。杆的表面光洁度如何影响旋转微动和摩擦扭矩的大小。使用基于埃克塞特杆的FEA模型对这些问题进行了评估，该模型具有笔直，无领，双锥度的形状。

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