Investigating the surgical outcomes transitioning from a traditional grammont-style valgus-medialized reverse shoulder arthroplasty to a varus lateralized reverse shoulder implant

While initial postoperative improvements in AER favors the 135° NSA system compared to the 150° NSA system, both implant types yielded comparable outcomes in range of motion, VAS pain, ASES scores, and complications. In spite of this, there are multiple technical points and important differences between the 2 design philosophies that are consequential for surgeons to personalize patient treatment plans, minimize complications, optimize shoulder biomechanics, and refine outcomes.