Rotator cuff disease encompasses a wide range of pathology from minimal bursal or articular side irritation and tendonitis to severe degenerative rotator cuff arththropathy. Rotator cuff pathology affects adults of all ages and other shoulder afflict ions must be ruled out by careful history and physical examination. In recent past small tears were treated arthroscopically while larger tears would require an open procedure. Arthroscopic procedures should serve as adjuncts to and not as replacements for thorough clinical evaluation; arthroscopy is not a substitute for clinical skills. Progressive improvements in the lens systems of arthroscopies and fibre optic systems, in miniaturization,and in the accessory operative instruments have made possible advanced operative arthroscopic techniques for virtually every joint in the body, including the knee, shoulder, hip, ankle and elbow The purpose of this study is to determine functional outcome of arthroscopically treated rotator cuff tears using UCLA shoulder scoring system and ASES shoulder score. In our study we have results showing pre operative and post operative UCLA and ASES scores of 56 patients treated arthroscopically in our institute for partial as well as full thickness tears. We noted that there was no difference in functional outcome in both partial and full thickness tears proven statistically. There are less chances of post operative stiffness and early mobilization possible with strict post operative physiotherapy protocol