When the joint surfaces of an elbow are separated, the elbow is
dislocated. Elbow dislocations can be complete or partial. In a
complete dislocation, the joint surfaces are completely
separated. In a partial dislocation, the joint surfaces are only
partly separated. A partial dislocation is also called a
subluxation. The elbow is both a hinge joint and a ball and
socket joint. As muscles contract and relax, two unique motions
occur at the elbow. - Bending occurs through a hinge joint that
allows the elbow to bend and straighten. This is called flexion
and extension, respectively. - Rotation occurs though a ball and
socket joint that allows the hand to be rotated palm up and palm
down. This is called pronation and supination, respectively.
Injuries and dislocations to the elbow can affect either of
these motions. Elbow dislocations are not common. Elbow
dislocations typically occur when a person falls onto an
outstretched hand. When the hand hits the ground, the force is
sent to the elbow. Usually, there is a