PURPOSE: To evaluate the result of modified Bosworth method augmented with Mersilene tape(MBM) compared with modified Bosworth method(MB). MATERIALS AND METHODS: Thirty two acromiclavicular dislocation wrer treated with MB(15cares) or MBM(17 cases) and the mean follow up period was 26 months(12-43 months). We assessed the radiological and clinical evaluation(X-Ray & Weitzman Criteria) and complications. RESULTS: Twenty nine cases(91%)(MB 13, MBM 16) were "excellent" or "good" according to the Weitzman criteria. At last follow-up, mean difference of the coracocalvialar distance between the normal and the injured site were 1.9mm(MB) and 1.6mm(MBM) and two ceses were developed the arthritis, and then performed the distal clavicle resection. CONCLUSION: Modified Bosworth method augmented with Mersilene tape is a good option for acromioclavicular dislocation in stabilizing the joint, even if the screw loosening occurs with early postoperative ROM.