Rotator interval

Abstract

Rotator interval (RI) is an important anatomical entity with a significant role in shoulder stability. Rotator interval refers to the interspace between the supraspinatus and subscapularis tendons through which courses the long head of biceps tendon. Coracohumeral and superior glenohumeral ligaments are also located in this area. Clinical and biomechanical studies indicated that the rotator interval has importance in the stability and biomechanics of shoulder functions by controlling the anteroinferior translation and also the external rotation of the adducted shoulder. RI is a dynamic structure of which dimensions vary with shoulder movements. Surgical treatment of the RI is suggested in instability procedures. There is agreement that rotator interval closure decreases translation of the shoulder in anterior and inferior directions. However, its effect on the posterior translation is questionable.