Development of a Rate-Dependent Material Model for UHMWPE Joint Replacement Components

W. Houchaime, A. Petrella, T. Dietz, J. Halloran, P. Rullkoetter
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Abstract

Polyethylene wear has been implicated in osteolysis and can lead eventually to implant loosening. Abrasive/adhesive wear and delamination or pitting damage in ultra-high molecular weight polyethylene (UHMWPE) joint replacement components has been in part attributed to high joint contact stresses. The propensity of total joint replacement systems for these types of wear is often assessed by evaluating the joint contact stresses and contact areas and these often serve as a basis for differentiation of systems. The rate-dependency of polyethylene can have a significant effect on these contact characteristics of joint replacement components. Previously, researchers have used experimental and analytical methods to determine joint contact characteristics. Most of the analytical studies, however, have not included the important time-dependent behavior of UHWMPE.
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超高分子量聚乙烯关节置换部件速率相关材料模型的建立
聚乙烯磨损与骨溶解有关,最终可导致植入物松动。超高分子量聚乙烯(UHMWPE)关节置换部件的磨料/粘合剂磨损和分层或点蚀损伤部分归因于高关节接触应力。对于这些类型的磨损,通常通过评估关节接触应力和接触面积来评估全关节置换系统的倾向性,这些通常作为区分系统的基础。聚乙烯的速率依赖性可以对关节置换部件的这些接触特性产生显著影响。以前,研究人员使用实验和分析方法来确定关节接触特性。然而,大多数分析研究都没有包括UHWMPE重要的时间依赖行为。
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