人工股骨柄形状和表面处理对置换术后假体和人体股骨应力分布影响的有限元分析
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Finite element analysis of the influence of shape and surface treatment of artificial stem on stress distribution of prostheses and femur after total hip replacement
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    摘要:

    目的建立人工髋关节置换术后的三维有限元模型,分析研究人工股骨柄、骨水泥和人体股骨的应力分布。方法应用三维重建软件及Pro/Engineer建模软件和ABAQUS有限元分析软件计算分析人工股骨柄中空形状和柄部预处理范围对置换术后假体和人体股骨应力分布的影响。结果(1)倒立圆锥形中空特征的骨水泥固定型股骨柄的应力最小,其股骨柄周围骨水泥近端应力亦较低。(2)具有上涂层骨水泥的股骨柄可使骨水泥近端产生的应力减小,且股骨柄与骨水泥二者之间的剪力和相对滑动亦较小。(3)随着非骨水泥固定型股骨柄微孔涂层范围的增加,人体股骨上的应力范围下移,人体股骨近端的应力减小。结论(1)采用倒立圆锥形中空特征的人工股骨柄有助于降低人体股骨近端与假体接触区的应力遮挡效应。(2)采用股骨柄上涂层骨水泥的方法,可增强股骨柄与骨水泥界面的结合强度,有利于降低人工髋关节置换术后的假体松动。(3)非骨水泥固定型股骨柄微孔涂层范围对人体股骨的应力有明显的影响,微孔涂层范围过大不利于保持适中的人体股骨的应力和股骨柄的固定。

    Abstract:

    Objective A three dimensional finite element model after total hip replacement was established to analytically study the stress distribution of the artificial stem, bone cement and human femur. Methods The influence of the hollow shape and surface treatment of the stem on stress distribution of the prostheses and femur after total hip replacement was calculated and analyzed using 3-D reconstruction software, Pro/ Engineer software and ABAQUS finite element software. Results (1) The stress value of the cemented stem with a upside-down tapered hollow is lowest, and the proximal cement stress is lower. (2) Using the stem with the cement coat in the upper stem can reduce the stress of the proximal cement, the interface shear stress and relative slippage between the stem and cement. (3) The stress area in the human femur transfers down with the tiny-hole coating range in the uncemented stem increasing, so the proximal human femur stress descend. Conclusions (1) The use of upside-down tapered hollow stems to reduce proximal femur stress shielding could be profitable. (2) Using the stem with the cement coating in the upper stem can increase the adhesive strength at the interfaces with the stem and the cement, which is helpful to reduce prosthesis loosening of hip replacements. (3) The effects of the tiny-hole coating range of uncemented stems on the human femur stress are obvious, and the large tiny-hole coating range is disadvantageous tomaintaining suitable human femur stress and the stem fixation.

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郑晓雯,封小建,张延宾.人工股骨柄形状和表面处理对置换术后假体和人体股骨应力分布影响的有限元分析[J].医用生物力学,2006,21(4):322-327

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