Shoulder anatomy bones

Radiographic images of frontal views of shoulders before and after total shoulder arthroplasty. (A) The preoperative anatomy and (B) the placement of the humeral component can be clearly seen. The UHMWPE glenoid component in (B) is radiolucent and is evident only as a space between the humeral component and bone of the glenoid (images courtesy of Jon jP Warner, Massachusetts General Hospital). 

In neuropathies around the shoulder, the small size of nerves, the complex regional anatomy and problems of access due to the acoustic shadowing from superficial bone structures, makes direct evaluation of nerves difficult with US. Axillary neuropathy may be caused by stretching injuries (anterior dislocation) or extrinsic compression in the quadrilateral space caused by fractures of the upper humerus, improper use of crutches, casts, fibrous bands and inferior (from the 9 to 7o clock positions) paragle-... 

FIGURE 9.1 Normal anatomy of the Glenohumeral joint showing the bones, muscles, tendons, ligaments, and capsule at the shoulder in frontal section (A) and glenoid face (B) views. The superia- (S), inferior (1), medial (M), lateral (L), anterior (A) and posteria- (P) directions are also denoted on each view (images used with permission of Primal Pictures, Ltd., London). 

---