A sliding-distance-coupled finite element formulation for polyethylene wear in total hip arthroplasty
A sliding-distance-coupled finite element formulation for polyethylene wear in total hip arthroplasty
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DOI：
10.1016/0021-9290(95)00125-5
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发表时间：
1996-05-01
影响因子：
2.4
通讯作者：
Callaghan, JJ
中科院分区：
文献类型：
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作者：
Maxian, TA;Brown, TD;Callaghan, JJ
使用与滑动距离耦合磨损算法相关的全髋关节置换术的三维非线性接触有限元（FE）模型，研究三种不同股骨头尺寸的聚乙烯磨损率。在FE模型中使用来自经确认步态分析模型的髋关节合成载荷，以确定站立阶段16个离散瞬间聚乙烯关节面上的接触应力分布。股骨头表面上的点的滑动距离由相应的屈曲/伸展运动学获得。磨损率由定制编写的计算机程序确定，该程序使用耦合接触应力、滑动距离和销盘确定的磨损系数的关系。通过该公式计算的磨损率完全在每种部件尺寸的临床观察范围内。
A three-dimensional, nonlinear contact finite element (FE) model of total hip replacement, linked to a sliding-distance-coupled wear algorithm, was used to study polyethylene wear rates for three different Femoral head sizes. Hip resultant loads from a validated gait analysis model were used in the FE model to determine contact stress distributions on the polyethylene bearing surface, for 16 discrete instants of stance phase. Sliding distances of points on the femoral head surface were obtained from the corresponding flexion/extension kinematics. Wear rates were determined by a custom-written computer program that used a relationship that coupled contact stress, sliding distance, and a pin-on-disk determined wear coefficient. The wear rates computed by this formulation were well within clinically observed ranges for each component size.