Lateral epicondylitis, or more commonly known as tennis elbow, is a condition that affects the lateral (outside) aspect of the elbow. The extensor muscles of the forearm attach on the lateral epicondyle of the humerus. With repetitive movements such as gripping, the extensor tendons pull on the epicondyle. Repeated muscular contraction causes small tears in the tendon followed by an ineffective healing process that leads to a chronic degeneration. Tennis elbow is frequently observed in the patient’s dominant arm and the most common tendon injured is the extensor carpi radialis brevis.