The rotator interval is a triangular space between the subscapularis and supraspinatus tendons, often implicated in various shoulder conditions including adhesive capsulitis. The four tendons of the rotator cuff—supraspinatus, infraspinatus, teres minor, and subscapularis—work together to stabilize and facilitate shoulder movements. While the supraspinatus primarily assists in shoulder abduction, the infraspinatus and teres minor are responsible for external rotation. Meanwhile, the subscapularis enables internal rotation of the shoulder. The rotator cuff interval is anatomically connected to these tendons and helps to prevent excessive anterior translation of the humeral head, thereby maintaining joint stability during arm movements.