Review Question - QID 219840

A 68-year-old female with a history of osteoporosis on Alendronate and a multi-year history of the problem shown in Figure A undergoes a surgical procedure to alleviate her constant pain. She initially does well but returns to the clinic at 9 months post-operatively with persistent pain located “on top” of the shoulder. She returned to golfing 3 months ago, but now cannot swing a golf club or lift her arm above 70 degrees of forward flexion without pain. Representative images from her post-operative CT scan are shown in Figures B-E. Which of the following most accurately describes the mechanism by which this complication occurs?