Type II clavicle fractures have been associated with high rates of nonunion and delayed union. Many authors have supported open reduction and internal fixation of these fractures. Authors analyzed twelve cases of type II distal clavicle fractures which had been treated operatively at department of orthopaedic surgery, Korea university, Ansan and Guro Hospitals from May 1991 to September 1997 and reviewed the result of operative treatment retrospectively. The results were as follows; 1. Among the 12 cases, male was 8, fenale was 4 and the average age of them was 25.6 years. 2. According to the classification by Neer and Rockwood, type IIa was 5 cases and IIb was 7 cases. 3. We treated all the cases operatively, such as C/R with transacromial K-wire fixation in 6 cases, O/R with transacromial K-wire fixation in 4 cases, O/R with coracoclavicular screw fixation in 2 cases. 4. The average follow-up period was 17 months. The functional results were evaluated with Kona classification and showed excellent in 10 cases, good in 2 cases. In conclusion, the operative treatment revealed good functional results in all cases. Authors recommend early operative treatment in type II distal clavicle fractures.