title: Charnley low-frictional torque arthroplasty for avascular necrosis of the femoral head.
abstract: Forty-nine patients (mean age, 37 years; 20-50 years) had had 69 Charnley low-frictional arthroplasties for avascular necrosis of the femoral head. Their mean follow-up was 13.4 years (2-25 years). Five patients (8 hips) had no continuing follow-up, 5 (8 hips) are known to have died, 6 (7 hips) had had a revision at a mean follow-up of 16.4 years (11-25 years): 6 for cup loosening and 1 for a fractured stem and a loose cup. The remaining 33 patients (46 hips) had an excellent clinical result with all stems remaining soundly fixed, but 6 cups were radiologically loose at a mean follow-up of 16 years and 4 months. Wear and cup loosening are the main problems limiting the survival of the arthroplasty.
authors.affiliation: The John Charnley Research Institute, Wrightington Hospital, Nr Wigan, UK.
authors.forename: B M
authors.initials: BM
authors.lastname: Wroblewski
authors.forename: Paul D
authors.initials: PD
authors.lastname: Siney
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Fleming
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D005260:Female; D005271:Femur Head Necrosis / Q000601:surgery*; D005500:Follow-Up Studies; D017276:Friction; D006801:Humans; D008297:Male; D008875:Middle Aged; D019415:Torque