title: Double acetabular wall--a misleading point for hip arthroplasty: an anatomical, radiological, clinical study.
abstract: OBJECTIVE
  Despite the great attention focused on cup positioning in primary total hip arthroplasty (PTHA), it is surprising to find so few studies that have dealt with cup placement. A common thwarting problem for correct cup placement during PTHA is the existence of osteophytes, which obscure the anatomical landmarks. In this study we aimed to evaluate the morphology of acetabular osteophyte formation in patients with osteoarthritis.
  
  
  METHODS
  We evaluated 276 patients with hip complaints, using plain X-rays and CT scans.
  
  
  RESULTS
  Of these patients, 57 underwent surgery. We developed a staging system for central osteophytes in hip osteoarthritis based on the radiographic and anatomical findings of our patients.
  
  
  CONCLUSIONS
  We recommend routine use of CT scans for patients scheduled for PTHA in order to assess the stage of osteophyte before surgery and, thus, reduce the risk of failure resulting from the interrupted acetabular landmarks.
authors: Department of Orthopedic Surgery Akhtar Hospital, Shahid Beheshti University of Medical Sciences, Apt 5, No 1835, Shariati Ave, Tehran, 19338-43653, Iran. fmedadi@yahoo.com
authors: Firooz
authors: F
authors: Madadi
authors: Hamed
authors: H
authors: Yazdanshenas
authors: Firoozeh
authors: F
authors: Madadi
authors: Shahrzad
authors: S
authors: Bazargan-Hejazi
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery; D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000379:methods*; D005260:Female; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D054850:Osteophyte / Q000000981:diagnostic imaging* / Q000473:pathology* / Q000601:surgery; D011475:Prosthesis Failure; D012189:Retrospective Studies; D012307:Risk Factors; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome