Dislocations of the acromioclavicular joint are common injuries in sports and traffic accidents. The most widely used classification of these injuries is the one of Tossy, Tossy III and Tossy II injuries are indications for operative treatment. Among several different surgical approaches a very common procedure is the temporary fixation of the AC-joint by two pins, tendon band wiring and suturing of the ligaments. Recently we have been using a temporary transfixation by only one pin, tension band fixation with PDS and suturing of the ligaments. The advantages of this method are: preservation of clavicular rotation, easier operation and metal removal, and less damage of the joint cavity. Results and complications are presented.