title: [The German Society of Orthopedics and Traumatology classification of bone defects in total hip endoprostheses revision operations].
abstract: OBJECTIVE
  In revision alloarthroplasty the need for bone allografts increased. The documentation of the defects is not done routinely.
  
  
  METHODS
  For better documentation the German Society for Orthopedics and Traumatology (DGOT) developed a new and practical defect classification system. It was tested clinically in the last 6 years.
  
  
  RESULTS
  In the acetabulum and femoral shaft seven defect types were distinguished and presented in figures. For the acetabulum: 1 cavitary holes, 2-4 unisegmental, 5 bisegmental, 6 trisegmental, 7 pelvic instability. For the femur: 1 intramedullary 2 trochanter 3 calcar 4 med. shaft 5 lat. shaft 6 part. diaphysis 7 total diaphysis.
  
  
  CONCLUSIONS
  With this classification system we could better compared different reconstruction approaches in endoprosthetic surgery.
authors.affiliation: Klinik und Poliklinik für Allgemeine Orthopädie, Westfälische Wilhelms Universität Münster.
authors.forename: D
authors.initials: D
authors.lastname: Bettin
authors.forename: B D
authors.initials: BD
authors.lastname: Katthagen
mesh_terms: D000077:Acetabulum / Q000601:surgery; D016025:Bone Transplantation / Q000145:classification*; D005269:Femur / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D011183:Postoperative Complications / Q000145:classification / Q000601:surgery*; D011475:Prosthesis Failure; D017755:Prosthesis Fitting; D012086:Reoperation