Contact analysis of UHMWPE tibial component based on geometrical measurement for retrieved knee prosthesis

Changhee Cho, Teruo Murakami, Yoshinori Sawae, Nobuo Sakai, Hiromasa Miura, Tsutomu Kawano, Yukihide Iwamoto

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)1284-1290
Number of pages7
JournalNippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Volume68
Issue number4
DOIs
Publication statusPublished - Apr 2002

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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