The shoulder is a ball and socket joint that connects our arms to our bodies. It is the body’s most mobile joint and can turn in virtually any direction. A dislocation occurs when the bone of your upper arm (humerus) pops out of the socket (glenoid labrum) that houses it. The humerus can fully pop out or just partly protrude from the socket, in what is known as a partial dislocation or a shoulder subluxation. The humerus can pop forward, in which case it’s an anterior dislocation, and is the case for most first-time dislocations. If the humerus pops backward, it’s called a posterior dislocation.