title: Dislocation of a posterior stabilized total knee prosthesis. A report of two cases.
abstract: Posterior stabilized knee prostheses have been recommended for knees with posterior cruciate deficiency, as well as for knees with prior patellectomy. Two cases are presented in which a complete dislocation of a Kinematic II Stabilizer prosthesis occurred after primary knee arthroplasty. The mechanism of dislocation was a varus or valgus stress while the knee was flexed. This previously unreported complication of dislocation after primary knee arthroplasty with a posterior stabilized knee prosthesis was, we believe, due, in part, to the design of this prosthesis, which provides little mediolateral stability in flexion, in combination with a mild degree of laxity of the collateral ligaments. This complication could be prevented by use of a prosthesis with greater inherent mediolateral stability.
authors.affiliation: University of California, Los Angeles 90024.
authors.forename: J S
authors.initials: JS
authors.lastname: Gebhard
authors.forename: D J
authors.initials: DJ
authors.lastname: Kilgus
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000601:surgery; D007720:Knee Prosthesis / Q000009:adverse effects*; D008023:Ligaments, Articular / Q000473:pathology; D008297:Male; D008875:Middle Aged; D010329:Patella / Q000601:surgery; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013314:Stress, Mechanical