title: Interprosthetic dislocations of the Charnley/Hastings hemiarthroplasty--report of 11 cases in 350 consecutive patients.
abstract: We report 11 cases of interprosthetic dislocation of the Charnley/Hastings hemiarthroplasty in a retrospective study of 350 consecutive patients treated for an acute femoral neck fracture. We found a total of 14 dislocations (4.0%), 11 were interprosthetic. The median age of the 350 patients was 79 (36-99) years and the median age of the 11 patients with an interprosthetic dislocation was 85 years (82-94). The median time from surgery to radiologically acknowledged dislocation was 18 (4-64) days. These interprosthetic dislocations may be caused by either an assembly mistake perioperatively, by maximum angulation and impingement between the components, or by trauma.
authors.affiliation: Ullevål University Hospital, Department of Orthopaedics, Orthopaedic Centre, Kirkeveien 166, NO-0407 Oslo, Norway. wender@mac.com
authors.forename: Wender
authors.initials: W
authors.lastname: Figved
authors.forename: Ole-Jacob
authors.initials: OJ
authors.lastname: Norum
authors.forename: Frede
authors.initials: F
authors.lastname: Frihagen
authors.forename: Jan Erik
authors.initials: JE
authors.lastname: Madsen
authors.forename: Lars
authors.initials: L
authors.lastname: Nordsletten
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects* / Q000295:instrumentation*; D005260:Female; D005265:Femoral Neck Fractures / Q000601:surgery*; D006617:Hip Dislocation / Q000000981:diagnostic imaging / Q000209:etiology*; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D011859:Radiography; D012189:Retrospective Studies