title: Use of 3D MR reconstructions in the evaluation of glenoid bone loss: a clinical study.
abstract: OBJECTIVE
  To assess the ability of 3D MR shoulder reconstructions to accurately quantify glenoid bone loss in the clinical setting using findings at the time of arthroscopy as the gold standard.
  
  
  METHODS
  Retrospective review of patients with MR shoulder studies that included 3D MR reconstructions (3D MR) produced using an axial Dixon 3D-T1W-FLASH sequence at our institution was conducted with the following inclusion criteria: history of anterior shoulder dislocation, arthroscopy (OR) performed within 6 months of the MRI, and an estimate of glenoid bone loss made in the OR using the bare-spot method. Two musculoskeletal radiologists produced estimates of bone loss along the glenoid width, measured in mm and %, on 3D MR using the best-fit circle method, which were then compared to the OR measurements.
  
  
  RESULTS
  There were a total of 15 patients (13 men, two women; mean age, 28, range, 19-51 years). There was no significant difference, on average, between the MRI (mean 3.4 mm/12.6 %; range, 0-30 %) and OR (mean, 12.7 %; range, 0-30 %) measurements of glenoid bone loss (p = 0.767). A 95 % confidence interval for the mean absolute error extended from 0.45-2.21 %, implying that, when averaged over all patients, the true mean absolute error of the MRI measurements relative to the OR measurements is expected to be less than 2.21 %. Inter-reader agreement between the two readers had an IC of 0.92 and CC of 0.90 in terms of percentage of bone loss.
  
  
  CONCLUSIONS
  3D MR reconstructions of the shoulder can be used to accurately measure glenoid bone loss.
authors: Department of Radiology, NYU Langone Medical Center, 660 First Avenue, New York, NY, 10016, USA, soterios20@gmail.com.
authors: Soterios
authors: S
authors: Gyftopoulos
authors: Luis S
authors: LS
authors: Beltran
authors: Avner
authors: A
authors: Yemin
authors: Eric
authors: E
authors: Strauss
authors: Robert
authors: R
authors: Meislin
authors: Laith
authors: L
authors: Jazrawi
authors: Michael P
authors: MP
authors: Recht
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional / Q000379:methods*; D007593:Joint Instability / Q000209:etiology / Q000473:pathology*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D012783:Shoulder Dislocation / Q000150:complications / Q000473:pathology*; D012785:Shoulder Joint / Q000473:pathology*