title: Can post-cam function be replaced by addition of a third condyle in PS TKA?
abstract: The purpose of the study was to analyze the effectiveness of an additional ball and socket articulation in implanted knees and whether it can replicate post-cam function. Fifteen knees implanted with a cruciate substituting (CS) polyethylene without a post and ten knees implanted with a posterior stabilized (PS) polyethylene with a post were analyzed using 3D model fitting approach. Two types of designs showed similar posterior translation and similar axial rotation. Most of the contact points at the ball and socket joint stayed within the socket height for the PS group. This study indicates that the ball and socket joint is able to function as a replacement of the post-cam mechanism, which might serve as a new way to achieve posterior stability.
authors.affiliation: Center for Musculoskeletal Research, University of Tennessee, Knoxville, Tennessee.
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Nakamura
authors.affiliation: Center for Musculoskeletal Research, University of Tennessee, Knoxville, Tennessee.
authors.forename: Adrija
authors.initials: A
authors.lastname: Sharma
authors.affiliation: Department of Orthopedic Surgery, Tamatsukuri-Koseinenkin Hospital, Matsue, Shimane, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Nakamura
authors.affiliation: Department of Orthopedic Surgery, Tamatsukuri-Koseinenkin Hospital, Matsue, Shimane, Japan.
authors.forename: Noboru
authors.initials: N
authors.lastname: Ikeda
authors.affiliation: Center for Musculoskeletal Research, University of Tennessee, Knoxville, Tennessee.
authors.forename: Sumesh M
authors.initials: SM
authors.lastname: Zingde
authors.affiliation: Center for Musculoskeletal Research, University of Tennessee, Knoxville, Tennessee.
authors.forename: Richard D
authors.initials: RD
authors.lastname: Komistek
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000379:methods*; D001696:Biomechanical Phenomena / Q000502:physiology; D005260:Female; D005269:Femur / Q000502:physiology / Q000601:surgery; D006801:Humans; D007719:Knee Joint / Q000502:physiology* / Q000601:surgery*; D007720:Knee Prosthesis; D008297:Male; D011095:Polyethylenes; D016119:Posterior Cruciate Ligament / Q000502:physiology / Q000601:surgery; D011474:Prosthesis Design; D016059:Range of Motion, Articular / Q000502:physiology; D012399:Rotation; D013977:Tibia / Q000502:physiology / Q000601:surgery
chemical_list: D011095:Polyethylenes
keywords: deep knee bend; knee kinematics; post-cam mechanism; total knee arthroplasty; tri-condylar implants