摘出人工膝関節の形状測定に基づく超高分子量ポリエチレン脛骨コンポーネントの接触解析(機械要素,潤滑,工作,生産管理など)

概要

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The wear phenomenon of ultra-high molecular weight polyethylene (UHMWPE) in the knee and hip prostheses is one of the major restriction factors on the longevity of these implants. Especially in retrieved knee prostheses with anatomical design, the most predominant types of wear on UHMWPE tibial components are pitting and delamination. These fatigue wear of UHMWPE are believed to result from the repeated plastic deformation due to high contact stresses. In this study, elasto-plastic contact analysis of the UHMWPE tibial component based on geometrical measurement for retrieved knee prosthesis was performed using FEM to investigate the plastic deformation behavior in the UHMWPE tibial component. The results suggest that the maximum plastic strain below the surface is closely related to the subsurface crack initiation and delamination of the UHMWPE tibial component. The worn surface with improved geometrical congruity showed lower contact stress.
一般社団法人日本機械学会の論文
2002-04-25