As a ball and socket joint, the shoulder is incredibly mobile and allows arm movement in many directions. As such, it is inherently unstable, and thus is prone to dislocation. When the shoulder is dislocated, the head of the humerus is removed from its socket in the glenoid fossa. The shoulder may dislocate in various directions.

Sternoclavicular joint anterior dislocation

Sternoclavicular joint posterior dislocation


Link to procedure here.