title: Hip resurfacing and osteonecrosis: results from an independent hip resurfacing register.
abstract: BACKGROUND
  Single surgeon studies from specialized centers have suggested that metal-on-metal hip resurfacing in patients with osteonecrosis of hip joint provides good implant survival and function.
  
  
  METHODS
  We tested the hypothesis that multicenter results of hip resurfacing, in terms of function and survival, are similar between patients with osteoarthritis and osteonecrosis.
  
  
  METHODS
  192 patients (202 hips) underwent metal-on-metal hip resurfacing at different centers around the world. We compared the revision risks in 95 patients (101 hips) with osteonecrosis and 97 patients (101 hips) with osteoarthritis.
  
  
  RESULTS
  The mean age at operation was 42 and 43 years and the preoperative and postoperative Harris hip scores were 62 and 96 and 58 and 95 for osteonecrosis and osteoarthritis groups. Survival with revision for any reason as the end point at last follow-up was 97.7% for osteonecrosis and 95.0% for osteoarthritis.
  
  
  CONCLUSIONS
  We conclude that hip resurfacing can be offered to patients with osteonecrosis.
authors.affiliation: Institute of Orthopaedics, RJAH Orthopaedic Hospital, Oswestry, UK. Aulakh_tajeshwar@yahoo.com <Aulakh_tajeshwar@yahoo.com>
authors.forename: Tajeshwar S
authors.initials: TS
authors.lastname: Aulakh
authors.forename: Chandra
authors.initials: C
authors.lastname: Rao
authors.forename: Jan-Herman
authors.initials: JH
authors.lastname: Kuiper
authors.forename: James B
authors.initials: JB
authors.lastname: Richardson
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D005260:Female; D006621:Hip Joint; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery*; D010020:Osteonecrosis / Q000601:surgery*; D011446:Prospective Studies; D012042:Registries; D012086:Reoperation; D055815:Young Adult