title: Reliability of the radiographic variables in the International Spinal Cord Injury Spinal Column Injury Basic Data Set compared with the AO classification.
abstract: METHODS
  Intra- and interrater reliability study for radiological variables of the International Spinal Cord Injury (SCI) Spinal Column Injury Basic Data Set.
  
  
  OBJECTIVE
  To test reliability of the radiological variables in the International SCI Spinal Column Injury Basic Data Set and compare it with the Arbeitsgemeinschaft für Osteosynthesefragen (AO) classification.
  
  
  METHODS
  The database of Eastern Denmark Regional SCI Referral Center, Copenhagen, Denmark.
  
  
  METHODS
  Ratings of the International SCI Spinal Column Injury Basic Data Set radiological variables and AO classification were obtained by two international observers for all the surgically treated spine trauma patients between 1st October 2010 and 31st December 2012 at the Spine Unit, Rigshospitalet, Denmark. Statistical analyses for intra- and interrater crude agreement and Cohen's unweighted kappa (κ) coefficients were performed.
  
  
  RESULTS
  For 283 spine injuries, the intra- and interrater reliability for the individual radiological variables of the International SCI Spinal Column Injury Basic Data Set was at least substantial (κ=0.67-0.97 for interrater, κ=0.79-0.89 for the intrarater agreement). For the AO classification, intrarater reliability was moderate-to-substantial (κ=0.57-0.75), whereas interrater reliability was substantial (κ=0.67-0.69). The crude intra- and interrater agreement for a combined radiographic SCI Spinal Column Injury Basic Data Set variable showed no significant difference compared with the AO classification (P=0.067-0.895).
  
  
  CONCLUSIONS
  The reliability of International SCI Spinal Column Injury Basic Data Set radiological variables is comparable to the AO classification system. We encourage its use for spinal column injury description, thus facilitating data collection and comparison between centres and countries.
authors.affiliation: Spine Unit, Department of Orthopaedic Surgery, Rigshospitalet, Copenhagen, Denmark.
authors.forename: C
authors.initials: C
authors.lastname: Lucantoni
authors.affiliation: Spine Unit, Department of Orthopaedic Surgery, Rigshospitalet, Copenhagen, Denmark.
authors.forename: R G
authors.initials: RG
authors.lastname: Krishnan
authors.affiliation: Spine Unit, Department of Orthopaedic Surgery, Rigshospitalet, Copenhagen, Denmark.
authors.forename: M
authors.initials: M
authors.lastname: Gehrchen
authors.affiliation: Spine Unit, Department of Orthopaedic Surgery, Rigshospitalet, Copenhagen, Denmark.
authors.forename: D W
authors.initials: DW
authors.lastname: Hallager
authors.affiliation: Clinic for Spinal Cord Injuries, Neuroscience Center, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.
authors.forename: F
authors.initials: F
authors.lastname: Biering-Sørensen
authors.affiliation: Spine Unit, Department of Orthopaedic Surgery, Rigshospitalet, Copenhagen, Denmark.
authors.forename: B
authors.initials: B
authors.lastname: Dahl
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D016208:Databases, Factual; D003718:Denmark; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011859:Radiography; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012720:Severity of Illness Index; D013119:Spinal Cord Injuries / Q000145:classification* / Q000000981:diagnostic imaging / Q000473:pathology*; D013131:Spine / Q000000981:diagnostic imaging*; D055815:Young Adult