title: Complete 180° rotatory dislocation in a mobile-bearing knee prothesis.
abstract: Dislocation of the rotator platform in mobile-bearing total knee arthroplasty is a well-documented, albeit uncommon, phenomenon. A review of the literature has revealed multiple case reports describing spin out to 90° or complete extrusion of the polyethylene component. Closed reduction may be attempted in the acute presentation followed by revision if instability persists. We present a case of a 57-year-old woman who had a partial rotatory subluxation of her polyethylene component and underwent closed reduction resulting in a full 180° spinout. To our knowledge, this has not been described in the literature and should be considered as a possibility after closed reduction attempts. She was treated successfully with open exploration and poly exchange using a larger component.
authors.affiliation: University of Texas Health Science Center at San Antonio, Texas, USA.
authors.forename: Hussein W
authors.initials: HW
authors.lastname: Turki
authors.forename: Lorence
authors.initials: L
authors.lastname: Trick
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000209:etiology / Q000601:surgery; D031221:Knee Dislocation / Q000150:complications / Q000000981:diagnostic imaging* / Q000601:surgery; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000601:surgery; D007720:Knee Prosthesis; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D020959:Polyethylene; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation; D012399:Rotation; D016896:Treatment Outcome
chemical_list: D020959:Polyethylene