title: The incidence of the patellar clunk syndrome in a recently designed mobile-bearing posteriorly stabilised total knee replacement.
abstract: The patellar clunk syndrome describes painful catching, grinding or jumping of the patella when the knee moves from a flexed to an extended position after total knee replacement (TKR). The posterior stabilised TKR had been noted to have a higher incidence of this problem. Mobile-bearing posteriorly stabilised TKRs have been introduced to improve patellar tracking and related problems by a mechanism of self-alignment. We evaluated the patellar clunk syndrome in 113 knees in 93 patients with such a TKR at a mean follow-up of 2.3 years (2.0 to 3.2). The syndrome was identified in 15 knees (13.3%). Logistic regression analysis showed that the absolute value of the post-operative angle of patellar tilt was significantly associated with the occurrence of patellar clunk (p = 0.025). Patellar tracking should be carefully checked during surgery.
authors.affiliation: Department of Orthopaedic Surgery, Osaka City University Medical School, 1-4-3 Asahi-machi, Abeno-ku, Osaka, 545-8585, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Fukunaga
authors.forename: A
authors.initials: A
authors.lastname: Kobayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Minoda
authors.forename: H
authors.initials: H
authors.lastname: Iwaki
authors.forename: Y
authors.initials: Y
authors.lastname: Hashimoto
authors.forename: K
authors.initials: K
authors.lastname: Takaoka