MR Arthrography of Shoulder
The glenohumeral joint boasts the greatest range of motion of any peripheral joint in the body, but not without cost; it is also the most frequently dislocated joint in the body. Stability of this articulation is limited for two major reasons. The articulating surface of the glenoid is significantly smaller than that of the humeral head, and the joint capsule is redundant and provides little support. This unit presents a basic MR arthrography protocol for evaluation of glenohumeral joint instability.
Figure a2.20.1 The arm is extended at the patient's side and in neutral position, with the thumb pointed towards the ceiling. The coil is placed over the glenohumeral joint.
Figure a2.20.2 SPGR coronal localizer. The grid lines are set from above the acromioclavicular joint and extend to a point below the inferior aspect of the glenohumeral joint.
Figure a2.20.3 The grid lines are placed perpendicular to the spine of the scapula to perform the sagittal oblique images.
Figure a2.20.4 The grid lines are placed parallel to the spine of the scapula to perform the coronal oblique images.
Figure a2.20.5 The grid lines are located parallel to the supraspinatus tendon to perform the coronal oblique images.
Figure a2.20.6 ABER position with coil placement. See the abducted arm and the coil behind the axilla.
Figure a2.20.7 Localizer images parallel to the long axis of the humerus.
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