Contact Stress Analysis of the Conforming Post-Cam Mechanism in Posterior-Stabilized Total Knee Arthroplasty

Yukio Akasaki, Shuichi Matsuda, Takeshi Shimoto, Hiromasa Miura, Hidehiko Higaki, Yukihide Iwamoto

Research output: Contribution to journalArticle

25 Citations (Scopus)


The present study evaluated the effects of extent of conformity of post-cam design on contact area and stress at post-cam mechanism using 4 different posterior-stabilized prostheses. TRAC and Alpina with full-conformed post-cams exhibited the largest contact area at 90° and 120°. PFC sigma RPF with partial conformed post-cam had the largest contact area at 150°. Scorpio NRG with less conformed post-cam had smaller contact area than the others. Lifting of femoral component decreased contact area and increased contact stress of TRAC and Alpina. Recent modifications of post-cam design have increased contact area, contributing to lower contact stress. None of these prostheses exhibited constant low contact stress throughout flexion. Further modifications of post-cam mechanism are necessary to provide lower contact stress throughout deep knee flexion.

Original languageEnglish
Pages (from-to)736-743
Number of pages8
JournalJournal of Arthroplasty
Issue number5
Publication statusPublished - Aug 1 2008


All Science Journal Classification (ASJC) codes

  • Orthopedics and Sports Medicine

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