e508 Lower Trapezius Transfer (LTT) Performed at the Time of Reverse Shoulder Arthroplasty (RSA) with an Allograft-Prosthetic Composite (APC) Can Restore Active External Rotation in Shoulders with Posterosuperior Cuff Deficiency and Humeral Bone Loss

e530 Development of an Artificial Intelligence Approach to Automatically Identify Reverse Shoulder Arthroplasty Implant Designs on Postoperative Radiographs

e545 The O'Driscoll Classification of Coronoid Fractures: Intra and Interobserver Agreement and Clarification

Reverse Shoulder Arthroplasty (8 minutes): When do I do it and how?