Muscles are able to move bones by pulling on these tendons. Good strong rotator cuff muscles can help stabilize the shoulder. The shoulder joint capsule is a bag of tissue that completely surrounds the shoulder joint. The joint capsule is made up of ligaments that joint tgether to form this water tight bag. A ligament is a soft tissue structure made up of connective tissue.
Ligaments attach bones to bones.
The ligaments that make up the joint capsule have a considerable amount of slack, or looseness, so that the shoulder is unrestricted as it moves through its rather large range of motion. Sometimes the shoulder does not come completely out of the socket but slips partially out and then returns to its normal position. This is called subluxation. 97 out of 100 dislocations are anterior, meaning that the humerus slips out of the front of the shoulder socket. Only 3 out of 100 dislocate posteriorly, or out the back.