Patient/caregiver was instructed regarding anatomy of shoulder joint as follows: The shoulder joint is formed by three bones: upper arm bone (humerus), shoulder blade (scapula), and the collar bone (clavicle). The shoulder joint is mainly a ball and socket joint, in which the ball of the joint is formed by the round head of humerus. The socket is a hollow in the scapula or shoulder blade, which is called glenoid. The head of humerus sits [...]