A transverse ultrasound image of the normal rotator interval with the biceps tendon (BT) at the center of the image void arrows. The superior glenohumeral ligament (SGHL) and lies anterior to the biceps tendon, and the coracohumeral ligament (CHL) lies superiorly, forming the roof of the interval. Lateral to BT lies the supraspinatus muscle (SS) and medially lies the subscapularis muscle (SUB). The blue arrow indicates the target point of the needle in RI technique