title: Contact stress analysis of the conforming post-cam mechanism in posterior-stabilized total knee arthroplasty.
abstract: 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 degrees and 120 degrees . PFC sigma RPF with partial conformed post-cam had the largest contact area at 150 degrees . 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.
authors.affiliation: Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
authors.forename: Yukio
authors.initials: Y
authors.lastname: Akasaki
authors.forename: Shuichi
authors.initials: S
authors.lastname: Matsuda
authors.forename: Takeshi
authors.initials: T
authors.lastname: Shimoto
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Miura
authors.forename: Hidehiko
authors.initials: H
authors.lastname: Higaki
authors.forename: Yukihide
authors.initials: Y
authors.lastname: Iwamoto
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D001696:Biomechanical Phenomena; D017076:Computer-Aided Design; D005269:Femur / Q000601:surgery; D006801:Humans; D007720:Knee Prosthesis; D008422:Materials Testing / Q000379:methods*; D020959:Polyethylene; D011474:Prosthesis Design; D016059:Range of Motion, Articular; D013314:Stress, Mechanical
chemical_list: D020959:Polyethylene