Figure 3.

A 74-year-old male with reverse shoulder arthroplasty (RSA) dislocation with polyethylene liner dissociation

Findings/Technique - Anteroposterior (A) and axillary lateral (B) radiographic views again demonstrating the subluxated appearance found with polyethylene dissociation (red arrow). This patient had previously received revision RSA for prior dislocations. Despite the relatively normal appearance of the axillary radiograph (which is obtained by placing the arm in abduction) the anteroposterior radiograph clearly demonstrates the subluxation consistent with complete polyethylene dissociation (red arrow). Upon entry into the shoulder joint during surgery, the completely dissociated polyethylene was visualized (C). The patient is in a beach chair position with a view into the deltopectoral approach to the shoulder. The humeral tray (white arrow), polyethylene (blue arrow), and subscapularis/glenohumeral capsule (green arrow) are visualized.