Evaluation of MRI Findings for Recurrent Anterior Dislocation of the Shoulder.
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Most of the examinations for diagnosing recurrent anterior shoulder dislocation are invasive, however MRI is non-inasive, and is widely used recently.Pre-operative MRI of 20 patients (15 males 5 females) with recurrent anterior dislocation of the shoulder were investigated. All cases underwent arthroscopic examination followed by modified Bristow's operation. SET 1 and MPGRT2* weighted images were obtained in the horizontal and scapular coronal planes of the shoulder (signa 1.5 Tesla MRI). We evaluated MRI findings on the Hill-Sachs lesion and Bankart lesion and then compared these with arthroscopic and operative findings. MRI showed 14 with Hill-Sachs lesions, and 6 without it. However arthroscopic examination revealed 12 out of 14 Hill-Sachs lesions, in 2 cases the lesions could not be clearly observed, and in cases without Hill-Sachs lesions, 2 cases had false negative findings on arthroscopy. The sensitivity of MRI in the diagnosis of Hill-Sachs lesions was 86% and the specificity was 100%.Regarding the Bankart lesion, MRI showed 18 positive and 2 negative cases. However, at surgery 17 had Bankart lesions and 3 cases did not have the lesion. Which means one false positive case was diagnosed by MRI. The sensitivity of MRI in the diagnosis of Bankart lesions was 100% and the specificity was 67%.We divided the Bankart lesion cases into three groups; defect of labrum, avulsion or tear of labrum and honey Bankart. From MRI findings there were 9, 7, and 2 cases respectively.Defect of the labrum and honey Bankart coincided with operative findings. However, in the avulsion or tear group, 4 showed avulsion or tear, 2 had defect of the labrum and the remaining one showed no abnormality.
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