This article cites study comparing the effectiveness of arthroscopic subacromial decompression and physiotherapy for patients who have shoulder pain with subacromial impingement. This randomized, unblinded, controlled study with 1-year follow-up was conducted over 90 patients in a hospital in Ringkjoebing County, Denmark. Patients were allocated to physiotherapy with training or arthroscopic surgery. Two experienced physiotherapists provided 19 sessions of physiotherapy for 12 weeks. Patients were encouraged to do the exercises at home daily. Patients in the surgery group had an investigation for stability of the shoulder joint under general anesthesia followed by arthroscopic examination of the glenohumeral joint, the rotator cuff, and the subacromial bursa. Study outcomes have shown the similar effectiveness of both arthroscopic subacromial decompression and physiotherapy.