What is a dislocated shoulder?
Because the shoulder is the most mobile joint in the human body, it’s highly susceptible to dislocation. When the shoulder is dislocated, the upper arm bone (humerus) pops out of its cup-shaped socket (glenoid). A dislocated shoulder is visibly deformed or out-of-place, so a patient will usually recognize that their shoulder is dislocated as soon as the injury occurs.
Dislocated shoulders can be either complete or partial. A partial dislocation, called a subluxation, occurs when the top of the humerus only partially comes out of its socket. A complete dislocation means that the head of the humerus is completely removed from the socket. Both are highly painful.
After the shoulder is dislocated, patients should not attempt to force the arm bone back into place. This can damage the joint, as well as the muscles, ligaments, nerves, and blood vessels that surround it, causing further injury. Instead, patients should ice the injured shoulder until they receive medical attention. After receiving treatment, most patients will need to undergo a physical therapy program to restore full range of motion.
Source:
Mayo Clinic