title: Major acetabular defects treated with the Burch-Schneider antiprotrusion cage and impaction bone allograft in a large series: a 5- to 7- year follow-up study.
abstract: BACKGROUND
  Major bone defects are the greatest challenge in hip revision arthroplasty.
  
  
  METHODS
  In a prospective, consecutive nonrandomised study we followed up 74 patients with Type III (AAOS) acetabular bone defects who underwent revision hip arthroplasty with bone grafting and implantation of a Burch-Schneider anti-protrusion cage (APC). The patients were examined pre- and postoperatively according to a standardised clinical and radiological protocol. No patient was lost to follow-up.
  
  
  RESULTS
  9 patients died before follow-up. In 9 other patients the APC was revised within the follow-up period. In 4 of these patients the revision was necessary because of aseptic loosening. In the remaining 5 cases joint infection, recurrent dislocation and 1 trauma were the reasons for revision. 56 patients were included in the statistical analysis. In the follow-up group the mean Harris Hip Score increased from 39.9 preoperatively to 73.2. 85% of the patients assessed their operation result as good or excellent.
  
  
  CONCLUSIONS
  In a large consecutive series the Burch-Schneider anti-protrusion cage proved to be a valuable option in the treatment of major acetabular bone defects in hip revision surgery.
authors.affiliation: Sana Kliniken Sommerfeld, Clinic for Orthopaedics, Kremmen - Germany.
authors.forename: Axel
authors.initials: A
authors.lastname: Marx
authors.affiliation: Sana Kliniken Sommerfeld, Clinic for Orthopaedics, Kremmen - Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Beier
authors.affiliation: Sana Kliniken Sommerfeld, Clinic for Orthopaedics, Kremmen - Germany.
authors.forename: Anne
authors.initials: A
authors.lastname: Richter
authors.affiliation: Otto-von-Guericke-University Magdeburg, Clinic for Orthopaedics, Magdeburg - Germany.
authors.forename: Christoph H
authors.initials: CH
authors.lastname: Lohmann
authors.affiliation: Sana Kliniken Sommerfeld, Clinic for Orthopaedics, Kremmen - Germany.
authors.forename: Andreas M
authors.initials: AM
authors.lastname: Halder
mesh_terms: D000077:Acetabulum / Q000601:surgery; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation / Q000379:methods*; D016025:Bone Transplantation / Q000379:methods*; D005260:Female; D005271:Femur Head Necrosis / Q000601:surgery*; D005500:Follow-Up Studies; D006617:Hip Dislocation / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D015207:Osteoarthritis, Hip / Q000601:surgery*; D011446:Prospective Studies; D011474:Prosthesis Design; D012086:Reoperation