Cementless Long-Stem Reverse Total Shoulder Arthroplasty as Primary Treatment for Metadiaphyseal Humeral Shaft Fractures.

RTSA = reverse total shoulder arthroplastyIMN = intramedullary nailORIF = open reduction and internal fixationAVN = avascular necrosisAP = anteroposteriorCT = computed topographyTSA = total shoulder arthroplastyXR = plain radiographsFU = follow-upSST = simple shoulder testASES = American Shoulder and Elbow SurgeonsDASH = Disabilities of the Arm, Shoulder and HandPROM = patient-reported outcome measuresROM = range of motion.