Acromio-clavicular joint dislocation occurs when both acromioclavicular and coracoclavicular ligaments are ruptured and brings to deformity, arthralgia and limitation of motion of the shoulder joint. The treatment of complete acromioclavicular dislocation is controversial, and both of the conservative and surgical treatment are reported to be relatively successful. But, conservative treatment have many disadvantages and now rarely advocated. Recently, there are increasing tendencies to treat the acromioclavicular dislocatioll with anatomical reduction of acromioclavicular joint and rigid internal fixation for early movement of shoulder Joint. We report the results of 16 cases of acute acromioclavicular dislocation treated with Phemister or modified Phemister method.