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Published on: March 12, 2021
Comparison between 2D and 3D computed tomography evaluation of glenoid bone defect in unilateral anterior
N Magarelli1, G Milano, P Baudi
1Dipartimento 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
Purpose:
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.
Materials And 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.
