title: Postoperative radiographic assessment of acetabular fractures: a comparison of plain radiographs and CT scans.
abstract: OBJECTIVE
  This investigation was designed to compare computerized tomography (CT) and plain radiography for detection of articular step and gap deformity after healing of operatively treated acetabular fractures.
  
  
  METHODS
  Retrospective review of CT and plain radiographic images of 15 patients treated operatively for a displaced acetabular fracture.
  
  
  METHODS
  Level I trauma center.
  
  
  METHODS
  Ability of CT scans and plain radiographs to detect residual articular steps and gaps after healing of acetabular fractures managed by open reduction and internal fixation.
  
  
  RESULTS
  Using standardized evaluation techniques, more patients were found to have residual articular incongruities on CT scans (8 with step and 7 with gap) than on plain radiographs (1 with step and 6 with gap). In addition, a step deformity on CT scan correlated with a gap deformity, and as the size of the step deformity increased, so too did the size of the gap deformity.
  
  
  CONCLUSIONS
  Based on our data, computerized tomography is more likely than plain radiographs to allow detection of residual articular incongruities in healed acetabular fractures. The authors believe that CT scans improve the evaluation of articular reduction and that this information can be used to further evaluate surgical technique and provide insight as to the impact of residual articular incongruity on the development of hip arthrosis.
authors.affiliation: Department of Orthopaedic Surgery, Barnes-Jewish Hospital, Washington University School of Medicine, St. Louis, MO 63110, USA. borrellij@msnotes.wustl.edu
authors.forename: Joseph
authors.initials: J
authors.lastname: Borrelli
authors.forename: William M
authors.initials: WM
authors.lastname: Ricci
authors.forename: Karen
authors.initials: K
authors.lastname: Steger-May
authors.forename: William G
authors.initials: WG
authors.lastname: Totty
authors.forename: Charles
authors.initials: C
authors.lastname: Goldfarb
mesh_terms: D000077:Acetabulum / Q000293:injuries*; D000328:Adult; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D005593:Fracture Fixation, Internal / Q000295:instrumentation / Q000379:methods*; D017102:Fracture Healing / Q000502:physiology; D050723:Fractures, Bone / Q000000981:diagnostic imaging* / Q000601:surgery; D006801:Humans; D015601:Injury Severity Score; D008297:Male; D008875:Middle Aged; D009984:Orthopedic Fixation Devices; D011182:Postoperative Care / Q000379:methods; D011336:Probability; D011859:Radiography / Q000379:methods; D020127:Recovery of Function; D012189:Retrospective Studies; D018570:Risk Assessment; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*; D016896:Treatment Outcome