title: Medium-term results of cementless hydroxyapatite-coated primary total hip arthroplasty: a clinical and radiological review.
abstract: OBJECTIVE
  To evaluate the clinical and radiological outcomes following cementless primary hydroxyapatite-coated total hip arthroplasty.
  
  
  METHODS
  A retrospective study of 69 patients (82 hips) who underwent uncemented hydroxyapatite-coated Anatomic Benoist Girard total hip replacement between October 1991 and October 1995 at our institution was conducted. Patient records were reviewed. All patients were evaluated clinically using the Merle D'Aubigne hip score, and osteointegration was assessed radiographically by analysing the bone implant interface in the 7 zones of Gruen on followup review.
  
  
  RESULTS
  The mean follow-up period was 7.3 years. Clinical results were excellent with an improvement seen in clinical score from 9.9 preoperatively to 16.5 at last review. A total of 15% of patients recorded some thigh discomfort, which was intermittent and not functionally limiting, except in 2 cases. There were 3 cases of severe acetabular osteolysis and loosening requiring revision surgery, and 4 cases of localised proximal femoral osteolysis around well-ingrown implants. There were few perioperative complications, with the exception of 5 dislocations of which 3 were recurrent and required a revision procedure.
  
  
  CONCLUSIONS
  Clinical and radiological outcomes following cementless hydroxyapatite-coated total hip arthroplasty were seen to be favourable in this medium-term retrospective study.
authors.affiliation: Department of Orthopaedic Surgery, Dunedin School of Medicine, University of Otago, PO Box 913, Dunedin, New Zealand. jean-claude.theis@stonebow.otago.ac.nz
authors.forename: J C
authors.initials: JC
authors.lastname: Theis
authors.forename: C
authors.initials: C
authors.lastname: Ball
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000295:instrumentation*; D001672:Biocompatible Materials / Q000009:adverse effects / Q000627:therapeutic use*; D001843:Bone Cements; D017886:Durapatite / Q000009:adverse effects / Q000627:therapeutic use*; D005260:Female; D005271:Femur Head Necrosis / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging* / Q000601:surgery; D011183:Postoperative Complications; D011859:Radiography; D012189:Retrospective Studies; D016896:Treatment Outcome
chemical_list: D001672:Biocompatible Materials; D001843:Bone Cements; D017886:Durapatite