Impingement syndrome is a symptom-complex characterized by chronic pain, relating to the unique anatomy of the shoulder girdle. Management consists of conservative and surgical treatment. Surgical intervention is considered only after failure to manage pain by prolonged non-operative means. The authors experienced 22 cases at the Department of Orthopaedic Surgery, National Police Hospital, from August, 1987 to May, 1991. The result as follows; 1. Simple division of coracoacromial ligament was performed in 11 cases, and division of coracoacromial ligament with anterior acromioplasty in 6 cases. In addition to coracoacromial ligament division, subacromial bursectomy and removal of calcification were done in one case. Coracoacromial ligament division and resection of malunited distal end of clavicle were performed in another case. The remaining three cases under went coracoacromial ligament division and anterior acromioplasty together with rotator cuff repair. 2. Follow-up ranges from 1 year to 4 years 10 months (average 2 year 8 months). 3. Patients were rated according to the criteria by Johansson. Follow-up results were excellent in 19 (86.4%) cases and satisfactory in 2 (9%) cases and unsatisfactory in 1 (4.5%) case. So we might conclude that surgical interventions give good results to the impingement syndrome of the shoulder.