elbow is a hinge joint made up of the humerus, ulna and radius.
The unique positioning
and interaction of the bones in the joint allows for a small amount of
rotation as well as hinge action. This rotation is easily noticed during
activities such as hand-to-mouth eating motions.
The primary stability
of the elbow is provided by the ulnar collateral ligament, on the
medial (inner) side of the elbow.
However, one of the
most common injuries to the elbow occurs on the lateral, or outer, side
of the elbow -- it is called Lateral Epicondylitis, or Tennis
Orthopedic Articles: Elbow Topics
Cubital Tunnel Syndrome