The long head tendon of biceps brachii enters the anterior part of the subacromial space after passing through the intertubercular sulcus of humerus, and ends at the supragenoid trochanter of scapula (Figure 1). The tendon slides passively in the intertubercle sulcus of humerus, that is, when the shoulder joint is adducted, rotated and extended, the tendon slides upward, while when the shoulder joint is abducted, rotated and flexed, the tendon slides downward. Tenosynovitis of the long head of biceps brachii is...