Shoulder instability occurs when your shoulder joint (ball and socket) has lost is normal alignment (ball resting symmetrically in the socket), which causes your arm to lose its support. The most ...

A dislocated shoulder occurs when the top part of the upper arm bone partially or fully comes out of the socket. A dislocated shoulder is painful and results in temporary loss of mobility and function ...

Posterior shoulder dislocation occurs when the top of the upper arm bone, known as the humerus, moves backward out of its socket. This causes pain, muscle spasms, and a limited range of motion. The ...