The elbow consists of three bones, the humerus, ulna, and radius. At the distal end of the humerus, there are two condyles, the medial and lateral epicondyles. This is a condition of the lateral epicondyle of the distal humerus. Also known as tennis elbow and often caused by overuse. It is an inflammation or microtearing of the extensor tendons on the outside of the elbow, which often results in pain and decreased function. The muscle most commonly impacted is the Extensor Carpi Radialis Brevis (ECRB). Often, pain increases during wrist or long finger resistive extension activities as well as tight gripping.