title: Glenoid bone loss: assessment with MR imaging.
abstract: OBJECTIVE
  To investigate the agreement among magnetic resonance (MR) imaging, computed tomography (CT), and arthroscopy in the measurement of glenoid bone loss.
  
  
  METHODS
  This study was approved by the institutional ethics committee. One hundred seventy-six patients (158 male and 18 female patients; mean age, 26.8 years ± 12.3) with anterior shoulder dislocation underwent both shoulder MR imaging and CT examination. Anterior straight line length, glenoid width, and best-fit bone loss were measured with MR imaging and CT. Sixty-five patients also underwent arthroscopy, which was used as the standard of reference. Assessment of glenoid bone loss at MR imaging was compared with that at CT and arthroscopy. Inter- and intrareader reproducibility of MR imaging-derived measurements of glenoid bone loss was evaluated.
  
  
  RESULTS
  There was excellent correlation between CT and MR imaging with regard to anterior straight line length (r = 0.97, P < .0001), glenoid width (r = 0.95, P < .0001), and severity of glenoid bone loss-particularly with use of best-fit circle width (r = 0.83, P < .0001) rather than best-fit circle area (r = 0.82, P < .0001). In the assessment of glenoid bone loss, the correlation between CT and arthroscopy (r = 0.91, P < .0001) was marginally better than that between MR imaging and arthroscopy (r = 0.84, P < .0001). The inter- and intrareader correlations of MR imaging-derived measurements of glenoid bone loss were excellent (R = 0.90-0.95).
  
  
  CONCLUSIONS
  MR imaging assessment of glenoid bone loss, particularly with use of glenoid width, is almost as accurate as CT assessment.
authors: Department of Imaging and Interventional Radiology and Department of Orthopedics and Traumatology, the Chinese University of Hong Kong, Prince of Wales Hospital, 30-32 Ngan Shing St, Shatin, NT, Hong Kong SAR, China. leekalok2909@yahoo.com.hk
authors: Ryan K L
authors: RK
authors: Lee
authors: James F
authors: JF
authors: Griffith
authors: Mabel M P
authors: MM
authors: Tong
authors: Nimish
authors: N
authors: Sharma
authors: Patrick
authors: P
authors: Yung
mesh_terms: D000293:Adolescent; D000328:Adult; D001182:Arthroscopy; D001862:Bone Resorption / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012540:Scapula / Q000000981:diagnostic imaging / Q000473:pathology*; D012783:Shoulder Dislocation / Q000000981:diagnostic imaging / Q000473:pathology*; D012785:Shoulder Joint / Q000000981:diagnostic imaging / Q000473:pathology*; D014057:Tomography, X-Ray Computed