The lateral epicondyle provides an attachment point for the radial collateral ligament, which contributes to the elbow joint, and the supinator, used to supinate the forearm. The lateral epicondyle also provides an attachment point for some of the extensor muscles of the forearm that extend, abduct, and adduct the hand and extend the fingers.
Overloading the tendons connected to the lateral epicondyle can lead to lateral epicondylitis, also known as tennis elbow. It is a painful condition that usually results from repetitive motions of the wrist and arm.
