A review of 15 cases of the modified Bristow operation for recurrent anterior shoulder dislocation from Jan. 1983 to Dec. 1988 was presented. Using arthroscopy, we could examined the pathologic feature of the recurrent anterior dislocation of the shoulder. The results are as following. 1. The ages at the initial dislocation were ranged from 15 to 26 years and operated from 19 to 61 years. 2. The most common injury mechanism of the dislocation was sports injury (5 cases) and followings were traffic accident, military training, hanging with one hand. 3. The 10 cases were dislocated above 10 times before operation and 3 were dislocated above 10 times per year. 4. Bony lesions were detected on routine X-ray at 8, that is A-P and lateral view, Hill-sach's view, Stryker-notch view and West point view, Hermoddson view, and apical obique view. 5. Arthroscopic examination was done at 7 cases and could detect the pathologic lesion more exactly. 6. All were treated with modified Bristow method 7. Mean follow up periods were 2 year and 4 monthes. 8. The range of motion was not limited but external rotation was done about 18. 9. Excellent results were obtained by Rowe's grading system, mean 88.8.