[Injuries of the acromio- and sternoclavicular joint--surgical or conservative treatment?].

At the acromioclavicular (AC) joint we distinguish between horizontal instability caused by damage to the AC ligament from vertical instability caused by damage to the coracoclavicular liagments. The most common mechanism of injury is direct force resulting from a fall onto the point of the shoulder. The injury is classified according to the amount of damage brought about by a given force. Horizontal and vertical instability have to be evaluated by special radiographic views. Types I and II are treated by a sling worn for a few days and the application of ice bags. In type III injuries the patient's age, job and acitve pursuits determine whether or not surgery is indicated. In type IV-VI injuries we always perform the operation. We use a resorbable cerclage between the clavicle and the coracoid process and suture all torn ligaments. In the sternoclavicular joint too, the ligamentous stability is of the utmost importance. The sternoclavicular ligament limits the ante- and retroversion of the clavicle, while the costoclavicular ligament limits the upward movement. The direction of subluxation or luxation has to be evaluated by means of an oblique view X-ray with a cephalic tilt of the tube through 40 degrees or by a computed tomogram. In the case of an acute injury closed reduction should always be attempted. Open recuction should only be performed in cases of persistent posterior luxation, because of the numerous complications that are possible in such cases.