title: Charnley total hip arthroplasty in Chinese patients less than 40 years old.
abstract: Forty-seven total hip arthroplasties were reviewed in 33 Chinese patients who were <40 years old at the time of operation. The preoperative diagnosis was avascular necrosis in 40% of the hips. A Charnley prosthesis was inserted using early cementing techniques in every hip. The average follow-up was 14.9 years (range, 6.9-21.1 years). The mean preoperative Harris hip score was 43.8 (range, 26-74), and the mean score at latest follow-up was 87.7 (range, 74-99) for the surviving hips. Thirty hips (63%) were revised, and 1 hip was removed because of late deep infection. The main cause of failure was aseptic loosening of the acetabular component. Using revision and radiologic loosening as endpoints, the cumulative survival rate for the acetabular component was 86.3% at 10 years and 27.0% at 15 years. The survival of the femoral components was 81.3% at 15 years. Patients with avascular necrosis had a higher failure rate than patients with other diagnoses (P =.001). An area of cement mantle that was <2 mm thick affected adversely the survival rate of the acetabular components (P =.04).
authors.affiliation: Division of Joint Replacement Surgery, Department of Orthopaedic Surgery, The University of Hong Kong, Room 516, Professorial Block, Queen Mary Hospital, Pokfulam, Hong Kong.
authors.forename: K Y
authors.initials: KY
authors.lastname: Chiu
authors.forename: T P
authors.initials: TP
authors.lastname: Ng
authors.forename: W M
authors.initials: WM
authors.lastname: Tang
authors.forename: K C
authors.initials: KC
authors.lastname: Poon
authors.forename: W Y
authors.initials: WY
authors.lastname: Ho
authors.forename: D
authors.initials: D
authors.lastname: Yip
mesh_terms: D000293:Adolescent; D000328:Adult; D019644:Arthroplasty, Replacement, Hip; D044466:Asian People; D002484:Cementation; D002681:China; D005260:Female; D005271:Femur Head Necrosis / Q000601:surgery; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D011475:Prosthesis Failure; D016459:Prosthesis-Related Infections; D011859:Radiography; D012086:Reoperation; D016019:Survival Analysis