Technique for Obtaining AP (A) and True AP (B) Radiographs of the Shoulder. In an AP View, the x-Ray Actually Represents an Oblique View of the Shoulder Joint. In a True AP View, the x-Ray Beam is Parallel to the Joint, So Overlap Between the Humeral Head and the Glenoid Surface is Minimal.

(From JawaA, RicchettiET. Glenulohumeral instability. In: Court-BrownCM, KeckmanJD, McQueenMM, et al., eds. Rockwood and Green’s Fractures in Adults. Vol 1. 8th ed. Philadelphia: Wolters Kluwer Health; 2015:1503–1571.)