title: [Acetabulum reinforcement ring with allograft bone for reconstructing acetabular defects in hip revision].
abstract: OBJECTIVE
  To evaluate the effectiveness of acetabulum reinforcement ring (Cage) with allograft bone for reconstructing acetabular defects in hip revision.
  
  
  METHODS
  Between February 2006 and August 2010, 14 patients (14 hips) with serious acetabular bone defects after total hip arthroplasty underwent acetabular reconstruction by using Cage with allograft bone. There were 6 males and 8 females with a mean age of 59.2 years (range, 45-76 years). The mean time between first replacement and revision was 7.2 years (range, 5-12 years). The revision causes included infection in 8 cases, osteolysis and aseptic loosening in 6 cases. The hip function Harris score was 37.7 +/- 5.3. According to America Association of Orthopedic Surgeon (AAOS) standard, the acetabular defect was classified as type III in 8 cases and as type IV in 6 cases.
  
  
  RESULTS
  All incisions healed by first intention, and no complication occurred. The patients were followed up 14-62 months (mean, 44 months). The pain was relieved or disappeared. At last follow-up, the Harris score was 89.7 +/- 3.2, showing significant difference when compared with preoperative score (t = -44.40, P = 0.04). No loosening of the acetabular component or osteolysis was found in 14 hips. No absorption or collapse of the allograft was observed in all patients.
  
  
  CONCLUSIONS
  Cage with allograft bone is a useful method of reconstructing acetabular bone defects in hip revision. Further follow-up is needed to assess the long-term effectiveness.
authors.affiliation: Department of Orthopaedics, West China Hospital, Sichuan University, Chengdu Sichuan 610041, PR China.
authors.forename: Wangwei
authors.initials: W
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.forename: Fuxing
authors.initials: F
authors.lastname: Pei
authors.forename: Bin
authors.initials: B
authors.lastname: Shen
authors.forename: Zongke
authors.initials: Z
authors.lastname: Zhou
authors.forename: Pengde
authors.initials: P
authors.lastname: Kang
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery*; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation / Q000379:methods*; D016025:Bone Transplantation; D005260:Female; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D016268:Internal Fixators; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000000981:diagnostic imaging / Q000601:surgery; D011475:Prosthesis Failure; D011859:Radiography; D016059:Range of Motion, Articular; D012086:Reoperation / Q000295:instrumentation / Q000379:methods; D014184:Transplantation, Homologous; D016896:Treatment Outcome