Review Question - QID 216859

A 64-year-old male presents to your clinic with a loss of range of motion of his right shoulder. He notes that he underwent an anatomic total shoulder arthroplasty (aTSA) on this shoulder approximately 10 years prior. His postoperative course was originally uncomplicated, but notes that he has had progressive loss of range of motion over the past 2 years. Infection work-up is negative, and a CT-scan demonstrates complete tearing with retraction and grade 3 fatty atrophy of both his supraspinatus and infraspinatus. What is the most common cause of early revision following the appropriate surgical treatment for this patient?