We treated 43 cases of the complete dislocation of the acromioclavicular dislocation with the modified Weaber and Dvnn method(22 cases), Phemister method(12 cases) and conservative method(9 cases) from April 1987 to February 1995. The purpose of this study is to compare the clinical and radiological results of two operative method and conservative treatment. The average follow up period was fifty sit months and the results were as follows:

1. Of the 43 patients, there was 34 male and 9 femaie patients, and peak incidence was in 3rd and 4th decades(4775).

2. Cause of injury was fall down (20 cases), traffic accident(12 cases), and slip down(11 cases) and left side was predominent with 26 cases(60%).

3. The functional result by the Weitzmann criteria was Excellent in 15 cases(68%), Good in 5 cases(23%), and Fair in 2 cases(9%) with Modified Weaber and Dunn method, and 8 cases(66%), 2cases(17%),and 2cases(17%) with Phemister method, and 5 cases(55%), 2 cases(23%), and 2cases(23%) with conservative treatment.

4. There were no maior complications that could affect the end results.

5. The functional results were similiar to all treatment modalities, and coracoclavicular interval ratio was well maintained regardless of two operative method, but less complication and more patient satisfaction were after Modifid Weaber and Dunn method.