The biceps muscle has two anchoring tendons, one of which passes into the shoulder joint and inserts onto the top of the socket. The tendon can become
irritated along its course within the joint or at the insertion point on the socket
The acromioclavicular joint is the articulation between the end of the collar bone and the shoulder blade. It is the joint in the body most commonly affected by
arthritis, but may also become displaced after injury.