Development and Physical Validation of a Finite Element Model of Total Hip Dislocation.
Development and Physical Validation of a Finite Element Model of Total Hip Dislocation.
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DOI：
10.1080/10255849908907983
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发表时间：
1999-01-01
影响因子：
1.6
通讯作者：
Callaghan, JOHN J.
中科院分区：
文献类型：
--
作者：
Scifert, CHRISTOPHER F.;Brown, THOMAS D.;Callaghan, JOHN J.
部件对部件的撞击以及随后的股骨头杠杆作用是全髋关节置换术中常见的脱位模式。虽然已经有许多基于注册的脱位发生率研究，但临床领域的混杂因素和变异性来源使得很难识别特定参数的影响。为了研究脱位事件，开发了三维非线性有限元模型，以便确定组件设计和临床植入位置等个别因素如何影响脱位倾向。此外，还构建了实验室测试设备以提供计算模型的物理验证。有限元模型正确预测了物理装置中观察到的运动范围，误差在 1% 以内，峰值阻力矩预测误差在 2.5% 以内。即使在 200 N 的轻关节载荷下，聚乙烯嵌件中产生的 von Mises 应力也达到 13 MPa，接触应力高达 30 MPa。这些有害的升高不仅发生在颈部撞击的部位，而且还发生在头部从衬里出口的部位。
Component-on-component impingement, followed by levering of the femoral head, is a common mode of dislocation in total hip arthroplasty. While there have been many registry-based studies of dislocation incidence, confounding factors and sources of variability in the clinical domain make it difficult to identify specific parameter influences. A three dimensional nonlinear finite element model has been developed for the purpose of studying the dislocation event, to allow determination of how individual factors such as component design and clinical implantation position affect the propensity for dislocation. Also, a laboratory testing apparatus was constructed to provide physical validation of the computational model. The finite element model correctly predicted the range of motion observed in the physical apparatus to within 1%, and predicted the peak resisting moment to within 2.5%. Under even a light joint load of 200 N, the von Mises stresses developed in the polyethylene insert reached 13 MPa, and the contact stresses rose to as high as 30 MPa. These deleterious elevations occurred not only at the site of neck impingement, but also at the site of head egress from the liner.