Klassifikation von Akromioklavikulargelenkverletzungen nach Allman



Grade ISprains of the acromioclavicular joint: The result of a mild force with only a few fibers of the acromioclavicular ligament and capsule involved. No laxity of the acromioclavicular joint. Pain is minimum, although point tenderness usually can be elicited over the acromioclavicular joint. The roentgenogram is negative initially, but later it may show subpei iosteal calcification about the distal end of the clavicle.
Grade II (Subluxation)Sprains (...) are usually the result of a moderate force which causes rupture of the capsule and acromioclavicular ligament. This injury frequently is referred to as a subluxation. No rupture of the coracoclavicular ligaments. Pain and tenderness are localized over the acromioclavicular joint, and laxity is present in the joint, frequently causing deformity. Roentgenograms reveal the clavicle riding higher than the acromion, but to an extent that is usually less than the width of the clavicle, even while downward stress is applied to the arm.
Grade III (Dislocation)Sprains of the acromioclavicular joint (...) are usually the result of a severe force with rupture of both the acromioclavicular and coracoclavicular ligaments. This injury frequently is referred to as a dislocation. Pain and tenderness are noted over the acromioclavicular joint and usually over the distal third of the clavicle and coracoid process. Deformity is obvious, and the distal end of the clavicle is easily palpable and ballotable. On the roentgenogram, the distal end of the clavicle is above the superior surface of the acromion, and the distance between the clavicle and the coracoid process is increased