title: Radiographic Measurement of Displacement in Acetabular Fractures: A Systematic Review of the Literature.
abstract: OBJECTIVE
  To report methods of measurement of radiographic displacement and radiographic outcomes in acetabular fractures described in the literature.
  
  
  METHODS
  A systematic review of the English literature was performed using EMBASE and Medline in August 2014. Inclusion criteria were studies of operatively treated acetabular fractures in adults with acute (<6 weeks) open reduction and internal fixation that reported radiographic outcomes. Exclusion criteria included case series with <10 patients, fractures managed >6 weeks from injury, acute total hip arthroplasty, periprosthetic fractures, time frame of radiographic outcomes not stated, missing radiographic outcome data, and non-English language articles. Basic information collected included journal, author, year published, number of fractures, and fracture types. Specific data collected included radiographic outcome data, method of measuring radiographic displacement, and methods of interpreting or categorizing radiographic outcomes.
  
  
  RESULTS
  The number of reproducible radiographic measurement techniques (2/64) and previously described radiographic interpretation methods (4) were recorded. One radiographic reduction grading criterion (Matta) was used nearly universally in articles that used previously described criteria. Overall, 70% of articles using this criteria documented anatomic reductions.
  
  
  CONCLUSIONS
  The current standard of measuring radiographic displacement in publications dealing with acetabulum fractures almost universally lacks basic description, making further scientific rigor, such as testing reproducibility, impossible. Further work is necessary to standardize radiographic measurement techniques, test their reproducibility, and qualify their validity or determine which measurements are important to clinical outcomes.
  
  
  METHODS
  Diagnostic Level IV. See Instructions for Authors for a complete description of levels of evidence.
authors.affiliation: Department of Orthopaedic Surgery, University of British Columbia, Vancouver, BC, Canada.
authors.forename: Andrew
authors.initials: A
authors.lastname: Dodd
authors.forename: Georg
authors.initials: G
authors.lastname: Osterhoff
authors.forename: Pierre
authors.initials: P
authors.lastname: Guy
authors.forename: Kelly A
authors.initials: KA
authors.lastname: Lefaivre
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging* / Q000293:injuries*; D000328:Adult; D005260:Female; D005593:Fracture Fixation, Internal / Q000379:methods; D017102:Fracture Healing / Q000502:physiology; D050723:Fractures, Bone / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D007593:Joint Instability / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D011859:Radiography / Q000379:methods*; D015203:Reproducibility of Results