title: Acetabular reconstruction with impaction bone-grafting and a cemented cup in patients younger than fifty years old.
abstract: BACKGROUND
  Acetabular bone deficiency can present a challenge during total hip arthroplasty, especially in young patients. The purpose of the present study was to evaluate the long-term clinical and radiographic outcomes of primary and revision acetabular reconstruction with use of an impaction bone-grafting technique and a cemented polyethylene cup in young patients who had preexisting acetabular bone deficiency.
  
  
  METHODS
  Forty-two consecutive acetabular reconstructions were performed in thirty-seven patients who were younger than fifty years old (average, 37.2 years old). The impaction bone-grafting technique was used for twenty-three primary and nineteen revision acetabular reconstructions. Twenty-eight patients (thirty-one hips) were available for review after a minimum duration of follow-up of fifteen years. Clinical and radiographic results were assessed, and survivorship analysis was performed with the Kaplan-Meier method.
  
  
  RESULTS
  Eight hips were revised at a mean of twelve years (range, three to twenty-one years) after a primary reconstruction (four hips) or revision reconstruction (four hips). The revision was performed because of aseptic loosening of the acetabular component in four hips and because of culture-proven septic loosening in two. Two additional cups (both in hips that had had a revision reconstruction) were revised, during revision of the femoral stem, because of wear (one hip) or because of persistent intraoperative instability (one hip). Twenty-eight hips (in twenty-five patients) had retention of the acetabular component for a minimum of fifteen years. The mean Harris hip score for that group was 89 points. Twenty-six of these twenty-eight hips had no or slight pain. Kaplan-Meier analysis revealed a twenty-year survival rate of 80% (95% confidence interval, 67% to 94%) with acetabular revision for any reason as the end point and of 91% (95% confidence interval, 80% to 100%) with acetabular revision because of aseptic loosening as the end point.
  
  
  CONCLUSIONS
  Acetabular reconstruction with use of impaction bone-grafting and a cemented polyethylene cup is a reliable and durable technique that is associated with good long-term results in young patients with acetabular bone-stock defects.
authors.affiliation: Department of Orthopaedics, University Medical Center Nijmegen, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands. b.schreurs@orthop.umcn.nl
authors.forename: B Willem
authors.initials: BW
authors.lastname: Schreurs
authors.forename: Vincent J J F
authors.initials: VJ
authors.lastname: Busch
authors.forename: Marianne L
authors.initials: ML
authors.lastname: Welten
authors.forename: Nico
authors.initials: N
authors.lastname: Verdonschot
authors.forename: Tom J J H
authors.initials: TJ
authors.lastname: Slooff
authors.forename: Jean W M
authors.initials: JW
authors.lastname: Gardeniers
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D016025:Bone Transplantation; D002484:Cementation; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging; D006801:Humans; D008875:Middle Aged; D011183:Postoperative Complications; D011475:Prosthesis Failure; D011859:Radiography; D012086:Reoperation; D016019:Survival Analysis