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 most commonly affected by arthritis,
but may also become displaced after injury.
A common condition, also known as "adhesive capsulitis", where there is inflammation and scarring of the lining of the shoulder joint that causes severe pain and
stiffness.