Moment arms of the anatomical subregions of the rotator cuff muscles during shoulder rotation

The posterior-deep subregion of the supraspinatus muscle behaved similar to the infraspinatus muscle, as an external rotator. The anterior-superficial and anterior-middle subregions of the supraspinatus muscle showed a biphasic behavior during rotation at a neutral position, but acted as pure external rotators during rotation at an abducted position. Inferior subregions of the infraspinatus and subscapularis muscles showed the largest moment arms compared to superior subregions. These findings support distinct functional roles of the rotator cuff muscle subregions.

Source: Clinical Biomechanics - July 5, 2023 Category: Orthopaedics Authors: Takuma Yuri, Jose H. Trevino, Kyosuke Hoshikawa, Alexander Hooke, Hugo Giambini Tags: Short communication Source Type: research