title: [Revision of failed acetabular cups with extensive structural allografts].
abstract: OBJECTIVE
  Structural allografts are used with encouraging results for revision of failed total hip arthroplasty and in the surgery of bone tumours. The aim of the present study is to describe the clinical and radiological results achieved with structural allografts in revision of a total hip arthroplasty.
  
  
  METHODS
  15 patients (12 female and 3 male patients) were revised with an acetabular defect situation of type 3 A or 3 B according to the Paprosky classification. Five fresh-frozen acetabula, nine distal femora and one proximal tibia were used for acetabular reconstruction. The rigid graft fixation was performed with 2 > or = AO screws. In one case a cemented acetabular ring was implanted, four cementless cups and ten cemented polyethylene acetabular components were used. The mean follow-up was 7.9 years (1.6-11.0 years).
  
  
  RESULTS
  A stable osseointegration of fifteen transplanted structural allografts was achieved in thirteen cases. Two allografts (one aseptic loosening, one deep infection) failed to osseointegrate. In one case the migration of a cementless cup was registered. Revision surgery of this female patient was performed successfully with a cemented reconstruction ring. The mean Harris hip score at the latest follow-up was 81.4 points (70-99 points).
  
  
  CONCLUSIONS
  For reconstruction of acetabular bone stock and restoration of the bone anatomy structural allografts can be recommended. The use of cementless cups in combination with structural grafts is to be evaluated as critical.
authors.affiliation: Klinik und Poliklinik für Orthopädie, Universität Duisburg-Essen, Essen.
authors.forename: G
authors.initials: G
authors.lastname: Saxler
authors.forename: J G
authors.initials: JG
authors.lastname: Fitzek
authors.forename: T
authors.initials: T
authors.lastname: Sterner
authors.forename: M
authors.initials: M
authors.lastname: von Knoch
authors.forename: B
authors.initials: B
authors.lastname: Barden
authors.forename: F
authors.initials: F
authors.lastname: Löer
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects* / Q000379:methods*; D016025:Bone Transplantation / Q000379:methods*; D005260:Female; D006621:Hip Joint / Q000601:surgery; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D007593:Joint Instability / Q000209:etiology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D012086:Reoperation / Q000379:methods; D014184:Transplantation, Homologous / Q000379:methods; D016896:Treatment Outcome