Review Question - QID 213034

A 70-year-old right-hand dominant female presents to your office complaining of continued right shoulder pain 12 weeks after falling from a ladder, despite participating in a rigorous physical therapy program. She was initially reduced in the emergency department and her injury films are shown in Figures 1 and 2. On exam, she has weakness on active elevation and external rotation, but full passive range of motion and intact sensation. New radiographs reveal no acute osseous abnormalities and a concentric reduction. What is best next step and which diagnosis will most likely be revealed?