Acromial and scapular fractures after reverse shoulder arthroplasty: comparison of 3018 reverse total shoulders by inlay and onlay humeral component design.

Background: Periscapular fractures, specifically acromial and scapular spine fractures, have been identified as one of the leading complications of reverse total shoulder arthroplasty (rTSA). However, very little is known of the etiology of these postoperative fractures, or how variations in humeral designs correlates with the risk of postoperative fracture development. Therefore, the purpose of this study was to analyze the prevalence, timing, and relationship of humeral component design to acromial or scapular spine fractures.