Biomechanical Consequences of Rotator Cuff Tears on the Glenohumeral Joint

Understanding the biomechanics of native and defect shoulder kinematics is key when approaching rotator cuff surgery, especially in revision cases. A complex interaction between dynamic and static stabilizers of the glenohumeral joint is key for providing optimal range of motion and sufficient function. Besides ensuring muscular balance and rotational function, the anatomy of the rotator cuff applies a compressive load to the glenohumeral joint throughout range of motion. The infraspinatus, teres minor, subscapularis, and the supraspinatus are acting as a muscular force couple, providing glenohumeral joint stability and contributing to humeral head centration.