When completing shoulder rehabilitation it is imperative you understand how the shoulder works.
The shoulder is a ball and socket joint that sits on the shoulder girdle which is made up of the scapula bone and collar bone.
The shoulder is a great joint, it allows us to rotate our arm 360 degrees. But for this extra movement comes extra instability. It is not as stable as the hip with its big socket and ball that sits nicely inside. The socket is more shallow and the ball sits on top, like a ball on top of a seals nose.
So the shoulder depends on the musculature system to provide it's stability, particularly the rotator cuff. This is a group of 4 muscles that come from you shoulder blade and attach to the front of the shoulder. They help move the arm but together they also become stabilisers, holding the upper arm bone in its socket. That is why a re- strengthening program of the rotator cuff is so important.