Lateral epicondylitis, also known as tennis elbow, is a restricting injury for active people that sometimes requires an injection of corticosteroid and local anesthetic for pain relief. The chief symptom is that activities that supinate or dorsiflex the wrist usually cause pain at the origin of the extensor muscle group (figure 1: not shown). This muscle group acts in extension of the wrist, hand, and digits, and in supination of the wrist. Medial to the lateral epicondyle are the radial nerve and the radial recurrent artery.