Glenohumeral JointIn this posterior view of the glenohumeral joint, the ultrasound probe is oriented transversely at the level of the scapular spine. A posterior view of the glenohumeral joint demonstrates proper horizontal alignment of the glenoid fossa of the scapula and the humeral head. The humeral head may be directly visualized moving within the glenoid fossa to confirm alignment. Lack of horizontal alignment of the scapula and the humeral head is pathologic and indicative of dislocation. The joint effusion may also be appreciated in this location.