J Korean Radiol Soc.
1995 Sep;33(3):415-421.
Recurrent Dislocation of the Shoulder: MR Imaging and MR Arthrographic Findings
Abstract
- PURPOSE
To evaluate and compare the diagnostic findings and usefulness of MRI and MR arthrogram in
recurrent anterior dislocation of the shoulder.
MATERIALS AND METHODS
MRI and MR arthrogram of thirty-two cases of thirty patients with recurrent anterior
dislocation of the shoulder were retrospectively analyzed to evaluate glenohumeral ligaments, pattern of
labral injury, bony Bankart lesion, capsular stripping, Hill-Sachs lesion, and loose body.
RESULTS
Labral abnormalities was detected on MRI in 23 cases(72%) and MR arthrogram in 22 cases(69%)
as labral tear, detachment, and deficiency. All cases involved anteroinferior labrum. On MR arthrogram, labral
abnormalities was confined to anteroinferior portion in 4 cases(18%), extended into midglenoid level in 13
cases(59%), and that into anterosuperior portion in 5 cases(23%). Capsular stripping was noted on MRI in 6
cases(19%) and MR arthrogram in 12 cases(38%). Loose body was detected only on MR arthrogram in 5 cases
(16%). Bony Bankart lesion and Hill-Sachs lesion was detected equally on MRI and MR arthrogram in 2 cases
(6%) and 21 cases(66%) respectively. We obtained identical findings on both MR arthrogram and operation field
in 6 patients.
CONCLUSION
MRI with its excellent soft tissue contrast resolution and multiplanar imaging capafility helps
detection of labral injury in recurrent anterior dislocation of the shoulder. MR arthrogram is slightly invasive,
but shows good artatomic details of labral-ligamentous-capsular relationship and thus provides accurate detec-
tion of pattern of labral injury, capsular stripping, and loose body.