Figure 3c. Right shoulder in a 54-year-old man. (a) Anteroposterior fluoroscopic image demonstrates a spinal needle (arrow) centered over the needle hub, just lateral to the medial cortex of the humeral head. Note the sclerotic line, which approximates the lateral border of the glenohumeral joint (arrowheads). (b) Anteroposterior fluoroscopic image shows the needle (arrow), which is angled medially toward the glenohumeral joint space after making contact with the humeral head. (c) Anteroposterior fluoroscopic image demonstrates intraarticular contrast material visualized between the glenoid and humerus (arrow).