Review Question - QID 219208

An otherwise healthy 72-year-old male presents with a three-part proximal humerus fracture (Figure A). He elects to undergo a trial of nonoperative measurement. However, at his 3-month follow-up appointment, he endorses significant activity-limiting pain (Figure B). After discussing options with his orthopaedic surgeon, he undergoes a reverse total shoulder arthroplasty. The surgeon elects to use a 135-degree revision stem implant, with a 10-degree inferior tilt and inferior offset glenosphere (Figure C). The subscapularis was not repaired at the end of the case. As a result of bony resection, which of the following complications is this patient most likely to develop?