Arthroscopy of the shoulder has developed during the last decade to play a major role in diagnoses and treatment of a variety of shoulder disorders. In most incidences, arthroscopy is required at the time of shoulder surgery to refine the final diagnosis. In over 75% of the cases are arthroscopic methods used for surgical repair of the shoulder pathology. This article describes the indications for surgery as well as the techniques to treat rotator cuff disease label injuries, etc. with the arthroscope. The arthroscopic techniques dealing with subacromial decompression and instability is described.