title: Long-term experience with Chiari's osteotomy.
abstract: Fifty-six years after the introduction of Chiari's pelvic osteotomy, we report the long-term function scores and radiographic grade of osteoarthritis in 66 patients with 80 pelvic osteotomies with a minimum followup time of 27 years (average, 32 years; range, 27-48 years). These 66 patients were those who could be contacted and who returned for a followup visit from among 450 patients operated between 1961 and 1981. Thirty-two hips (40%) in 28 patients had undergone a total joint arthroplasty after an average 26 years (range, 13-41 years). Forty-eight hips in 41 patients (60%) were not replaced, their Harris hip score being a median of 82 points (range, 37-100 points). For the 22 patients for whom we had complete radiographs the average preoperative CE angle was 11.6 degrees, 48.6 degrees (range, 31 degrees-82.8 degrees) immediately postoperatively, and 41.6 degrees (range, 13.7 degrees-90 degrees) at last followup . Despite a functional hip score in most patients retaining their native hip, the degree of osteoarthritis progressed at last followup. We observed a similar mean age at the time of osteotomy in patients converted to total hip arthroplasty and those retaining their native hip. Age at time of surgery was inversely correlated (r = -0.78) with the interval between the osteotomy and THA. In this select patient group we found good functional outcome in patients who underwent Chiari pelvic osteotomy, with a conversion rate of 40% to total hip arthroplasty a mean of 32 years after the procedure.
  
  
  METHODS
  Level IV, case series. See Guidelines for Authors for a complete description of levels of evidence.
authors.affiliation: Department of Orthopaedics, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria. rainer.kotz@meduniwien.ac.at
authors.forename: Rainer
authors.initials: R
authors.lastname: Kotz
authors.forename: Catharina
authors.initials: C
authors.lastname: Chiari
authors.forename: Jochen G
authors.initials: JG
authors.lastname: Hofstaetter
authors.forename: Andreas
authors.initials: A
authors.lastname: Lunzer
authors.forename: Philipp
authors.initials: P
authors.lastname: Peloschek
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D006618:Hip Dislocation, Congenital / Q000150:complications / Q000503:physiopathology / Q000601:surgery*; D006621:Hip Joint / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery; D010027:Osteotomy / Q000379:methods*; D010384:Pelvic Bones / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D011183:Postoperative Complications / Q000209:etiology* / Q000601:surgery; D011859:Radiography; D016059:Range of Motion, Articular; D012720:Severity of Illness Index; D016896:Treatment Outcome