PURPOSE: To evaluate the clinical and radiological result of surgical treatment of acromioclavicular joint dislocation, using modified Phemister technique with tension band wiring. MATERIALS AND METHODS: We chose 17 patients who were able to follow up 1 year or more among the patients who were diagnosed as acromioclavicular joint dislocation in our hospital through January 2000 to Feburary 2005 and took modified Phemister technique with tension band wiring. Evaluation of the surgical results was done with the condition of pain, activity of daily living, range of motion, muscle tone by constant score system, and with preoperative, postoperative and last follow up radiographs. RESULTS: Clinical evaluation was average 92 point by Constant score system from 84 point to 100 point. Subjective evaluation was 11 excellent (65%), 6 good (35%). Radiological evaluation was 9 excellent (54%), 6 good (38%), 2 fair (12%), and no poor group. On the final follow up, two cases showed inflammatory reaction at where pins were inserted, but after the removal of the pins, the inflammation was subsided. CONCLUSION: The modified Phemister surgery for acromioclavicular dislocation is one of effective techniques, we can obtain firm fixation, exercise full range of motion early and there is no complication of re-dislocation.