Shoulder instability occurs when the arm’s ball joint moves in and out of the shoulder socket joint. Chronically unstable shoulders can lead to loose shoulder joints that slip out of place repeatedly.

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 ...

A dislocation is a joint injury in which the bones are forced out of their usual positions and are completely separated. Your joints are where two or more bones meet. It can be hard to tell if a bone ...