Comprehension: Posterior Shoulder
Frontal Views of Right Shoulder
Two frontal (AP) projections of the right shoulder demonstrate the glenohumeral and acromioclavicular (AC) joints. In both of these images, the scapula overlies the upper aspect of the rib cage. Note the lateral (axillary) and medial (vertebral) borders of the scapula as well as the end-on view of the coracoid process. Frontal and tangential projections of the left shoulder are also shown. The frontal view brings out the greater tuberosity, and the anatomical and surgical necks of the humerus. The tangential view shows the relationship of the humeral head to the glenoid fossa. In this projection, the head of the humerus overlaps the glenoid fossa. The spine of the scapula and its blade are clearly seen.
Shoulder CRT Arthrogram
Four axial CT images of the shoulder are shown. These were done as part of a shoulder arthrogram. This study has been carried out after the injection of air and contrast material in the shoulder joint space. It was done to look for a tear in the joint capsule or a rupture of the glenoid labrum. No abnormality was seen. Note the recesses of the joint capsule about the long head of the biceps, the axillary recess, and the subscapularis recess (immediately inferior to the coracoid process). The bony relationships of the shoulder girdle are well seen in these projections.