(Purpose) Voluntary dislocation of the tendon of the long head of the biceps is extremely rare. Here we will report on this dislocation in one patient.
(Patient) The Patient, a 37-year-old male fell down with his arm extended. Since then, he had a click and pain of the shoulder when he elevated his arm. When he had contracted his biceps with his arm extended and internally rotated, the tendon of the long head of the biceps dislocated from the bicipital groove. By elevating the arm 135 degrees from that position, the tendon reposited with a click and pain. Arthrography showed a dislocation of the tendon of the long head of the biceps. Arthroscopy and a tenodesis of the biceps tendon were performed.
(Conclusion) When observing the shoulder joint of a cadaver, the insertion of the subscapularis tendon was separated into two layers. One was a superficial layer, the other a deep one. Some parts of the superficial layer formed the transverse ligament. So we believe that the tendon of the long head of the biceps is often dislocated accompanying with a tear of the subscapularis tendon.
