During shoulder arthroscopy, your surgeon inserts a small camera, called an arthroscope, into your shoulder joint. The camera displays pictures on a video monitor, and your surgeon uses these images to guide miniature surgical instruments.| orthoinfo.aaos.org
Your arm is kept in your shoulder socket by your rotator cuff. The rotator cuff is a group of four muscles that come together as tendons to form a covering around the shoulder. When one of these tendons is torn, it may be painful to lift or rotate your arm.| orthoinfo.aaos.org