Journal Article Rotator cuff repair Reverse shoulder arthroplasty Review complications Avascular necrosis Baseplate design Bone filler Bone graft CT imaging Fracture augmentation Inter-rater agreement Intraoperative assessment MR imaging Multivariable model Muscle atrophy Nonunion Occupation ratio Open reduction and internal fixation PENN shoulder score PROMs Preoperative factors Proximal humerus fracture RSA baseplate Shoulder Surgeon performance Tear characteristics Warner classification acromial fracture arm position