title: [Utility of a structured bone allograft for acetabular defects in the setting of a revision prosthesis].
abstract: BACKGROUND
  Coxarthrosis is considered as an increasingly frequent condition that will lead to an important demand for primary total hip arthroplasty in the coming decades and this, in turn, will increase the number of revision hip arthroplasties. The most common indications for revision are component loosening, hip ,instability and infection, with involvement of the acetabular component in more than 50% of revision procedures. Acetabular bone loss is one of the major challenges of revision hip arthroplasty.
  
  
  OBJECTIVE
  To determine, by means of imaging studies, allograft osseointegration using the AAOS radiographic scales, the performance grade of the affected hip using the Harris Hip Score (HHS), and patient personal satisfaction, as well as identify and describe complications.
  
  
  METHODS
  Observational, longitudinal, retrospective, descriptive, basic, clinical trial. The records of patients subjected to revision hip arthroplasty who experienced prosthetic loosening and had an acetabular defect treated with structured bone allograft between January 2007 and April 2012 were selected. Patients were followed-up at 6 and 12 months and compared with controls.
  
  
  RESULTS
  The total number of patients was 18, 61% females and 39% males. Age range was 47-79 years. The acetabular defect grade was as follows: 44.4% were IIB; 44.4% were IIC, and 11.2% were III, according to the Paprosky classification. The HHS went from 27 to 72.3 at one year. Osseointegration was 100% in 9 patients, 75% in 6, and 50% in 3 patients. One patient had acute periprosthetic infection.
  
  
  CONCLUSIONS
  This method represents a good treatment option for acetabular defects, as it provides significant improvement according to the HHS and proper allograft osseointegration, which helps patients increase their bone stock for future revision procedures.
authors.forename: L E
authors.initials: LE
authors.lastname: García-Anaya
authors.forename: J
authors.initials: J
authors.lastname: Negrete-Corona
authors.forename: J M
authors.initials: JM
authors.lastname: Jiminéz-Aquino
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D000368:Aged; D064591:Allografts; D019644:Arthroplasty, Replacement, Hip; D016025:Bone Transplantation; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D012086:Reoperation; D012189:Retrospective Studies