Purpose : To assess the utility of shoulder MRI by using ROC (receiver operating characteristic) curve in the evaluation of rotator cuff tear, anterior labral tear, superior labral tear and Hill-Sachs Lesion.Materials and Methods : We evaluated 38 arthroscopically confirmed patients who had undergone shoulder MRI. According to the signal intensity of the rotator cuff, as seen on T2 and proton density imaging, a five-stage grading system was devised. Labral tears were graded according to the separation of the labium; this was based on gleaned, morphologic and signal intensity changes of the labrum : six grades of anterior labral tear and three grades of superior labral tear. Hill-Sachs lesion was also classified into four grades according to morphologic and signal changes of the humeral head. These findings were reviewed by two musculoskeletal radiologists and ROC curves and areas under the curve (Az) was obtained.Results : The ratio of area under the curve of rotator cuff tear, anterior labral tear, superior labral tear and Hill-Sachs lesion were 82.4%, 88.5%%, 62.4% and 91.3%, respectively.Conclusion : The Accuracy of shoulder MRI using ROC curve was relatively high in rotator cuff tear, anterior labral tear and Hill-Sachs lesion, but low in superior labral tear.