title: Hip resurfacing arthroplasty in treatment of avascular necrosis of the femoral head.
abstract: BACKGROUND
  Hip resurfacing is a conservative type of total hip arthroplasty but its use is controversial, especially in patients with osteonecrosis. The aim of this study was analysis of the clinical and radiographic outcomes of hip resurfacing in patients with osteonecrosis.
  
  
  METHODS
  Between 2007 and 2008, 30 hip resurfacing arthroplasties were performed due to osteoarthritis secondary to avascular necrosis of femoral head staged as Ficat III and IV. Patients were qualified to resurfacing arthroplasty when the extent of avascular necrosis using Kerboul's method was <200° and the angle between avascular necrosis and head-neck junction was >20°. All patients were evaluated clinically and radiologically before and 60 months after the operation.
  
  
  RESULTS
  The mean Harris Hip Score (HHS) score increased from 47.8 to 94.25 (p<0.05). Physical activity level (University of California, Los Angeles activity score--UCLA activity score) improved from 3.7 to 7.55 (p<0.05). No implant migration was observed.
  
  
  CONCLUSIONS
  Management of osteonecrosis of the hip with resurfacing arthroplasty seems to be effective in strictly-selected patients.
authors.affiliation: Department of Trauma and Orthopaedics, District Trauma and Orthopaedic Hospital, Piekary Śląskie, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Pyda
authors.affiliation: Department of Trauma and Orthopaedics, District Trauma and Orthopaedic Hospital, Piekary Śląskie, Poland.
authors.forename: Bogdan
authors.initials: B
authors.lastname: Koczy
authors.affiliation: Department of Trauma and Orthopaedics, District Trauma and Orthopaedic Hospital, Piekary Śląskie, Poland.
authors.forename: Wojciech
authors.initials: W
authors.lastname: Widuchowski
authors.affiliation: Department of Internal Medicine and Rheumatology, Medical University of Silesia, Katowice, Poland.
authors.forename: Małgorzata
authors.initials: M
authors.lastname: Widuchowska
authors.affiliation: Department of Trauma and Orthopaedics, District Trauma and Orthopaedic Hospital, Piekary Śląskie, Poland.
authors.forename: Tomasz
authors.initials: T
authors.lastname: Stołtny
authors.affiliation: Department of Trauma and Orthopaedics, District Trauma and Orthopaedic Hospital, Piekary Śląskie, Poland.
authors.forename: Michał
authors.initials: M
authors.lastname: Mielnik
authors.affiliation: Department of Trauma and Orthopaedics, District Trauma and Orthopaedic Hospital, Piekary Śląskie, Poland.
authors.forename: Jacek
authors.initials: J
authors.lastname: Hermanson
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D015992:Body Mass Index; D005270:Femur Head / Q000000981:diagnostic imaging* / Q000601:surgery; D005271:Femur Head Necrosis / Q000000981:diagnostic imaging* / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010020:Osteonecrosis / Q000601:surgery; D011859:Radiography; D012189:Retrospective Studies; D016896:Treatment Outcome