The elbow joint is formed by three bones, the humerus, radius, and ulna. Articulations between the trochlea of the humerus with the ulna and the capitulum of the humerus with the head of the radius comprise the joint. The elbow is an example of a hinge joint, or a joint that moves in only one direction. The unique positioning and interaction of the bones in the joint allows for small rotations of the arm. The most common injury to the elbow occurs on the lateral side of the elbow, known as lateral epicondylitis or tennis elbow. Tennis elbow is caused by either abrupt or subtle injury of the muscle and tendon area around the outside of the elbow. Tennis elbow specifically involves the area where the muscles and tendons of the forearm attach to the lateral epicondyle. Tennis elbow most commonly affects people in their dominant arm.
The symptoms of tennis elbow are:
Pain slowly increasing around the outside of the elbow.
Pain is worse when squeezing an object (i.e. shaking hands)
Pain is made worse by stabilizing or moving the wrist with force (i.e. performing barbell chest presses)