Shoulder Arthroscopy is commonly used for treatment of diseases of the shoulder, including subacromial impingement, acromioclavicular osteoarthritis, rotator cuff tears, frozen shoulder, chronic tendonitis, removal of loose bodies and partial tears of the long biceps tendon, and shoulder instability. The most common indications include subacromial decompression, lesion repair and rotator cuff repair. The procedure is performed using a pencil-thin camera lens (arthroscope), that is inserted through a very small incision near the shoulder joint. Sterile fluid is used to fill the joint, making it easier to visualize internal knee structures. If the surgeon detects damage in need of repair, a second small incision is made and special instruments are inserted to treat the damaged area. This type of surgical procedure usually takes 30-45 minutes to complete and is routinely performed under general anesthesia.