“…It has previously been reported in biomechanical and clinical studies that implants with NSA <155° have greater range of motion particularly in external and internal rotation, and lower rates of notching. 33 , 40 , 46 , 59 , 62 Table III highlights that all groups experienced substantial improvements in range of motion. The <155° implant groups obtained clinically relevant greater range in external rotation (41° for 135° NSA, 33° for 145° NSA, and 17° for 155° NSA).…”