RELIABILITY AND VALIDITY STUDY OF A MEASUREMENT METHOD FOR THE GLENOID VERSION BY A 3-DIMENSIONAL BONE MODEL FROM 3.0 TESLA MRI

Objective The authors investigated reliability and validity of 3D-MRI bone model of scapula by comparing the Glenoid versions that were measured each in 3D-CT images and 3D-MRI images. Materials and Methods The scapula extraction DICOM data of MRI and CT was made to extract only a scapular domain. The scapula bone model was made with the scapula extraction DICOM data of MRI and CT. Glenoid version was measured on the scapula bone model. The mean and standard deviation of the Glenoid version was calculated by each imaging method (CT and MRI). Intraclass reliability of each imaging method (CT and MRI) and agreement between the two methods were evaluated. This was accomplished by calculating two separate measures of agreement: the intraclass correlation coefficient (ICC) and the Bland–Altman analysis. Results Glenoid version measured from the 3D-CT images averaged −0.679±3.797, with an ICC of 0.975. Glenoid version measured from the 3D-MRI images averaged −0.801±3.682, with an ICC of 0.980. Conclusions 3D-MRI bone model of scapula evaluated the reliability and the validity. 3D-MRI bone model of scapula was found to measure like 3D-CT bone model of scapula.