From March 1973 to May 1979 at Hanil Hospital, seven patients with acute complete disiocation and three patients with chronic complete dislocation of the acromloelavlcular Joint had been treated surgically by Weaver and Dunn method which combines resection arthroplasty of the acromioclavicular jolnt with flxation of the clavlcle In an anatomical position by suture of the acromial end of the shortened coracoacromial ligament into the medullary canal of the clavicle. The results were considerably good In both acute and chronic cases. Full range of motion was observed on average In eight weeks in most cases.