Acott TR, et al. - Researchers assumed that progressive deltoid lengthening would be correlated with an increasing number of these complications and that there would be a threshold of deltoid length beyond which these complications would be more common. They established three patient cohorts for comparison including nine individuals with deltoid-related complications (acromial fractures and deltoid dehiscence) and four with persistent deltoid pain and/or tightness that persisted at least 2 yr postoperatively and these were matched with a 1:2 control group drawn from the same database (26 patients without these complications). It was demonstrated that sufficient deltoid tensioning is vital to the stability of a reverse prosthesis as well as a patient range of motion and outcomes; nevertheless, improved deltoid lengthening during reverse total shoulder arthroplasty improves the risk of postoperative tension-related complications. After reverse total shoulder arthroplasty, the evidence indicated that lengthening more than 26 mm is a risk factor for deltoid-related complications.