title: Reliability and comparison of acromion assessment techniques on X-ray and magnetic resonance imaging (reliability of acromion assessment techniques).
abstract: OBJECTIVE
  To determine the reliability and correlation of plain radiography and magnetic resonance imaging (MRI) in the assessment of acromion morphology.
  
  
  METHODS
  Acromion morphology was assessed using the lateral acromion angle (LAA) and the acromion-humeral interval (AHI). Thirty patients who had X-rays and MRI for impingement syndrome were included. Six blinded observers assessed the acromion morphology subjectively and objectively.
  
  
  RESULTS
  Neither acromion assessment technique demonstrated a positive correlation (kappa and intraclass coefficient < 0.55) between X-ray and MRI. Both techniques were reliable (kappa and intraclass coefficient > 0.55) when measured objectively by experienced observers.
  
  
  CONCLUSIONS
  The LAA and the AHI are both reliable acromion assessment techniques on X-ray and MRI when measured objectively and by experienced observers.
authors.affiliation: Division of Orthopaedic Surgery, Department of Surgery, London Health Sciences Centre.
authors.forename: Darius G
authors.initials: DG
authors.lastname: Viskontas
authors.forename: Joy C
authors.initials: JC
authors.lastname: MacDermid
authors.forename: Darren S
authors.initials: DS
authors.lastname: Drosdowech
authors.forename: Greg J
authors.initials: GJ
authors.lastname: Garvin
authors.forename: Walter M
authors.initials: WM
authors.lastname: Romano
authors.forename: Ken J
authors.initials: KJ
authors.lastname: Faber
mesh_terms: D000174:Acromion / Q000000981:diagnostic imaging / Q000473:pathology*; D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D011859:Radiography; D015203:Reproducibility of Results; D000070636:Rotator Cuff Injuries; D019534:Shoulder Impingement Syndrome / Q000000981:diagnostic imaging / Q000473:pathology*