title: MRI can assess glenoid bone loss after shoulder luxation: inter- and intra-individual comparison with CT.
abstract: OBJECTIVE
  Computed tomography (CT) is the gold standard for evaluating glenoid bone loss in patients with glenohumeral dislocations. The aim of this study was to verify if magnetic resonance imaging (MRI) can quantify the area of bone loss without any significant difference from CT.
  
  
  METHODS
  Twenty-three patients, who had experienced one or more post-traumatic unilateral glenohumeral dislocations, underwent MRI and CT. MR and multiplanar reconstruction CT images were acquired in the sagittal plane: the glenoid area and the area of bone loss were calculated using the PICO method. Mean values, percentages, Cohen's kappa coefficients and Bland-Altman plots were all used to confirm the working hypothesis.
  
  
  RESULTS
  The mean glenoid surface area was 575.29 mm(2) as measured by MRI, and 573.76 mm(2) as measured by CT; the calculated mean glenoid bone loss was respectively 4.38% and 4.34%. The interobserver agreement was good (k>0.81), and the coefficient of variance was 5% of the mean value using both methods. The two series of measurements were within two standard deviations of each other.
  
  
  CONCLUSIONS
  MRI is a valid alternative to CT for measuring glenoid bone loss in patients with glenohumeral dislocation.
authors.affiliation: SCDU Radiologia, A.O.U. Maggiore della Carità di Novara, Corso Mazzini 18, 28100, Novara, Italy, a.stecco@libero.it.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Stecco
authors.forename: Elena
authors.initials: E
authors.lastname: Guenzi
authors.forename: Teresa
authors.initials: T
authors.lastname: Cascone
authors.forename: Francesco
authors.initials: F
authors.lastname: Fabbiano
authors.forename: Paolo
authors.initials: P
authors.lastname: Fornara
authors.forename: Paolo
authors.initials: P
authors.lastname: Oronzo
authors.forename: Federico Alberto
authors.initials: FA
authors.lastname: Grassi
authors.forename: Gregorio
authors.initials: G
authors.lastname: Cecchi
authors.forename: Mario
authors.initials: M
authors.lastname: Caniggia
authors.forename: Marco
authors.initials: M
authors.lastname: Brambilla
authors.forename: Alessandro
authors.initials: A
authors.lastname: Carriero
mesh_terms: D000328:Adult; D005260:Female; D061165:Glenoid Cavity / Q000473:pathology*; D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D007593:Joint Instability / Q000000981:diagnostic imaging / Q000473:pathology*; D008279:Magnetic Resonance Imaging; D008297:Male; D012783:Shoulder Dislocation / Q000000981:diagnostic imaging / Q000473:pathology*; D014057:Tomography, X-Ray Computed