CINE-MR OF THE SHOULDER - NORMAL PATTERN

Purpose: To define the normal patterns of gleno-humeral joint, with ki nematic MR imaging in asymptomatic volunteers. Material and method: Tw enty asymptomatic volunteers (39 shoulders) were studied with a 1.5 Te sla imager. Successive acquisitions Flash (99, 18, 15 degrees) were ob tained in the axial plane, from full internal to full external rotatio n, at the superior, mid and inferior glenoid level. Results: Free edge of the anterior labrum was noted slightly mobile, its base was always immobile. The anterior labrum exhibited modification of shape and inc reased signal intensity in internal rotation (54%). The posterior labr um remained motionless in 97% and neither shape or signal intensity ch anges were noted in internal rotation. Inferior labro-capsular ligamen tous complex was visualised in all cases. The anterior capsular joint was taut in external rotation and exhibited a slack (51%) or folded (1 3,5%) pattern during internal rotation. Conclusion: Kinematic MR imagi ng allows a dynamic assessment of the different anatomic components wh ich may be implicated in shoulder instability. It provides information about the labro-capsular ligamentous complex.