The short head of the biceps brachii muscle was removed from its origin with a thin piece of bone from the coronoid process and was transposed to the dislocated clavicle. From the action of muscle contraction from the biceps brachii muscle, the dislocated clavicle would be pulled downward. This method of repair was satisfactory in4 cases of acromioclavicular dislocation. Results obtained from the follow-up, there was no recurrence of dislocation, and the function and muscle power of the shoulder were completely normal.