Fractures of the acromion process are relatively rare, then no accepted treatment method has been established. The puroose of this study was to review of the acromion fracture in our cases, to determine trends in the mechanism of injury, the fracture pattern, and treatment method, and to evaluate the clinical results. 1. The types of fracture were type I-A in 4 cases, type I-B in 6 cases, type II in 6 cases, type III in 3 cases. 2. Clinical results were excellent in 9 cases(52.9%), good in 6 cases(29.4%), fair in 3 cases, poor in 1 case. 3. Type III fractures suggesting that early surgical intervention may be indicated.