title: Femoral component design and patellar clunk syndrome.
abstract: The effect of patellar design of the femoral component on the prevalence of patellar clunk was examined by comparing 179 consecutive Insall-Burstein II posterior-stabilized total knee replacements with 210 consecutive primary Advanced posterior-stabilized total knee replacements. In the Advanced posterior-stabilized knee replacements, the patellofemoral groove had been extended posteriorly 7.5 mm compared with the Insall-Burstein II implant. At a minimum followup of 2 years, the prevalence of patellar clunk syndrome in the patients with a Insall-Burstein II knee replacement was 3.9% (seven of 179) compared with 0% in the patients with an Advanced posterior-stabilized knee replacement. Based on these data, it seems that the design change in patellofemoral groove of the Advanced posterior-stabilized knee replacement has eliminated the problem of patellar clunks.
authors.affiliation: Department of Orthopaedic Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA. maloneyw@msnotes.wustl.edu
authors.forename: William J
authors.initials: WJ
authors.lastname: Maloney
authors.forename: Robert
authors.initials: R
authors.lastname: Schmidt
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Sculco
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects*; D001182:Arthroscopy; D003646:Debridement; D006801:Humans; D007719:Knee Joint / Q000502:physiology; D007720:Knee Prosthesis; D011474:Prosthesis Design; D016059:Range of Motion, Articular