title: Hip transposition as a limb salvage procedure following the resection of periacetabular tumors.
abstract: OBJECTIVE
  One of the most difficult problems in tumor surgery is the treatment of pelvic tumors, particularly those in the periacetabular region. This retrospective study serves to analyze clinical and functional outcome of the new surgical technique of hip transposition.
  
  
  METHODS
  Sixty-two patients were analyzed (chondrosarcoma 15, Ewing's sarcoma or PNET 26, osteosarcoma 14, synovial cell sarcoma 2, others 5) and clinical, oncological, and functional outcome were evaluated.
  
  
  RESULTS
  The surgical procedure focused on hip transpositions Type I (n = 9), Type IIa using the MUTARS attachment tube (n = 36), and Type IIb using the MUTARS attachment tube with a proximal femur endoprosthesis and bipolar cup (n = 17). In 53 patients (85.5%), wide margins were achieved. The 1- and 5-year overall survival rates were 96.4% and 80.5%, respectively. The 5-year (10 years) overall survival was 82.1% (82.1%) for Ewing's sarcoma, 60.1% (40.6%) for osteosarcoma, and 92.3% (46.2%) for chondrosarcoma. Wound healing problems were observed in 14 cases, deep infection in 20 cases. The mean Musculoskeletal Tumor Society (MSTS) score was 62% (18.6 Pts ± 3.73).
  
  
  CONCLUSIONS
  Hip transposition can be considered as an easy and safe surgical procedure to employ in order to achieve good functional outcome in periacetabular tumors.
authors.affiliation: Department of Orthopaedic Surgery, University Hospital Muenster, Muenster, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Gebert
authors.forename: Martin
authors.initials: M
authors.lastname: Wessling
authors.forename: Christiane
authors.initials: C
authors.lastname: Hoffmann
authors.forename: Robert
authors.initials: R
authors.lastname: Roedl
authors.forename: Winfried
authors.initials: W
authors.lastname: Winkelmann
authors.forename: Georg
authors.initials: G
authors.lastname: Gosheger
authors.forename: Jendrik
authors.initials: J
authors.lastname: Hardes
mesh_terms: D000077:Acetabulum / Q000601:surgery*; D000293:Adolescent; D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D002648:Child; D005260:Female; D006801:Humans; D023821:Limb Salvage; D008297:Male; D008875:Middle Aged; D010386:Pelvic Neoplasms / Q000601:surgery*; D012189:Retrospective Studies; D016896:Treatment Outcome