Abstract: Introduction; Impingement syndrome of the shoulder is a common diagnosis. Arthroscopic subacromial decompression is the gold standard of treatment. Many authors studied the use of subacromial decompression by bursectomy without acromioplasty and reported useful results with decompression with acromioplasty. There are no studies in the literature about the long term results of subacromial bursectomy and debridement without acromioplasty or release of the coracoacromial ligaments. Aim of the study: The aim of this prospective study is report the long term effect of subacromial debridement on symptoms of impingement syndrome Patients and methods: Between January 2002 and April 2006,37 patients were operated on for treatment of impingement syndrome of the shoulder in Benha University hospitals in Egypt. Twenty-three patients (17 males and 6 females) were available at the end of the study. The average age was 53.08 years (range 27-59 years). Follow up at least 8 years after the operation. evaluation using the University of California at Los Angeles rating scale (UCLA score). Results; The preoperative UCLA score compared to the score at the end of the study are detailed in (table 1). Eighteen patients (78.3%) had good and excellent scores while the other 5 patients (21.7%) showed poor and fair results at the end of the follow-up. Discussion: In the current study, the pain and function of the shoulder showed significant improvement (p-value < 0.05) in the long-term follow-up. There are 5 patients who showed poor and fair results over 8-12 years follow-up. These results are explained as a part of the degenerative process. The results of the current study are comparative with the long term results of subacromial decompression with acromioplasty. Conclusion: Arthroscopic subacromial debridement is an effective procedure for long term treatment of impingement syndrome of the shoulder.