lateral epicondyle of the humerus lateral epicondyle of the humerus the lateral epicondyle of the humerus is a large, tuberculated eminence, curved a little forward, and giving attachment to the radial collateral ligament of the elbow joint, and to a tendon common to the origin of the supinator and some of the extensor muscles. specifically, these extensor muscles include the anconeus muscle, the supinator, extensor carpi radialis brevis, extensor digitorum, extensor digiti minimi, and extensor carpi ulnaris. in birds, where the arm is somewhat rotated compared to other tetrapods, it is termed dorsal epicondyle of the humerus. in comparative anatomy, the term ectepicondyle is sometimes used. lateral epicondyle of the humerusthe supinator. (lateral epicondyle labeled at upper right.)left elbow-joint, showing posterior and radial collateral ligaments. (lateral epicondyle visible at center.)detailsidentifierslatinepicondylus lateralis humerita98a02.4.04.029ta21209fma23442anatomical terms of bone a common injury associated with the lateral epicondyle of the humerus is lateral epicondylitis also known as tennis elbow. repetitive overuse of the forearm, as seen in tennis or other sports, can result in inflammation of "the tendons that join the forearm muscles on the outside of the elbow. the forearm muscles and tendons become damaged from overuse. this leads to pain and tenderness on the outside of the elbow."