Jin Z M, Dowson D, Fisher J
Department of Mechanical Engineering, University of Leeds.
Proc Inst Mech Eng H. 1995;209(1):1-8. doi: 10.1243/PIME_PROC_1995_209_311_02.
A general elasticity contact theory has been developed to predict the contact area and the contact pressure in total knee joint replacements with elliptical contacts where the thickness of ultra high molecular weight polyethylene (UHMWPE) is similar or less than the contact half width. The interfacial boundary condition between the UHMWPE component and the underlying metal substrate has been considered to be either perfectly bonded or perfectly unbonded in the model. Poisson's ratio for UHMWPE has been assumed to be 0.3 or 0.4. The effect of the thickness of the UHMWPE layer on the contact area and the contact pressure has been examined. The predictions of the maximum contact pressure and the contact area have been presented in non-dimensional forms and can readily be applied for typical design configurations of current total knee joint replacements. Furthermore, the present results can readily be applied to design considerations for total knee joint replacements to reduce contact stresses within the UHMWPE component.
已开发出一种通用弹性接触理论，用于预测全膝关节置换中椭圆形接触的接触面积和接触压力，其中超高分子量聚乙烯（UHMWPE）的厚度与接触半宽相似或小于接触半宽。在该模型中，UHMWPE部件与下层金属基板之间的界面边界条件被视为完全粘结或完全不粘结。假设UHMWPE的泊松比为0.3或0.4。研究了UHMWPE层厚度对接触面积和接触压力的影响。最大接触压力和接触面积的预测以无量纲形式给出，可直接应用于当前全膝关节置换的典型设计配置。此外，目前的结果可直接应用于全膝关节置换的设计考虑，以降低UHMWPE部件内的接触应力。
