title: Comparison between 2D and 3D computed tomography evaluation of glenoid bone defect in unilateral anterior gleno-humeral instability.
abstract: OBJECTIVE
  This study evaluated the agreement between 2D and 3D computed tomography (CT) measurements in identifying the size and type of glenoid-bone defect in anterior glenohumeral instability.
  
  
  METHODS
  One hundred patients affected by unilateral anterior glenohumeral instability underwent a CT of both shoulders. Images were processed with both 2D [multiplanar reconstruction (MPR)] and 3D [volumerendering (VR)] methods. The area of the missing glenoid was calculated in comparison with the healthy glenoid and expressed as a percentage. Agreement between the two measurements was assessed according to the Bland-Altman method; a 5% mean difference was considered as clinically relevant.
  
  
  RESULTS
  Analysis of agreement between MPR and VR measurements of the percentage of missing glenoid showed a mean difference equal to 0.62%±1.96%. Percent agreement between the two measurements in detecting the presence of bone defect was 97% (p<0.0001). Percent agreement between the two measurements in discriminating the type of bone defect was 97% (p<0.0001).
  
  
  CONCLUSIONS
  Agreement between 2D (MPR) and 3D (VR) CT measurements to identify the size and type of glenoid-bone defect in anterior glenohumeral instability was so high that the two measurements can be considered interchangeable.
authors: Dipartimento di Bioimmagini e Scienze Radiologiche, Università Cattolica del Sacro Cuore, Policlinico A. Gemelli, Largo A. Gemelli 8, 00168, Roma, Italy. nicola.magarelli@rm.unicatt.it
authors: N
authors: N
authors: Magarelli
authors: G
authors: G
authors: Milano
authors: P
authors: P
authors: Baudi
authors: D A
authors: DA
authors: Santagada
authors: P
authors: P
authors: Righi
authors: V
authors: V
authors: Spina
authors: A
authors: A
authors: Leone
authors: R
authors: R
authors: Amelia
authors: C
authors: C
authors: Fabbriciani
authors: L
authors: L
authors: Bonomo
mesh_terms: D000293:Adolescent; D000328:Adult; D016009:Chi-Square Distribution; D016001:Confidence Intervals; D005260:Female; D006801:Humans; D006811:Humerus / Q000000981:diagnostic imaging*; D021621:Imaging, Three-Dimensional; D007593:Joint Instability / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011857:Radiographic Image Interpretation, Computer-Assisted; D012785:Shoulder Joint / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*