Epicondylitis is an inflammation of the epicondyle of a bone. The epicondyle is a small projection at the end of a long bone, above the condyle. Most often, epicondylitis is found in the elbow.

Epicondylitis is most often caused by repeated strain of the forearm and can affect either the medial or lateral epicondyle and surrounding muscle and tissue. The point at which muscles connect to the humerus at the elbow is small compared to the relative size and strength of the connecting muscles. As a result, forceful or jerking movements of the arm can sometimes damage or strain the tissues at this connection point.

Twisting the arm or wrist against a resisting force, such as using a screwdriver, can also cause the condition to develop. Improperly positioning the arms when lifting can strain the elbow and result in development of epicondylitis as well. Swinging an axe or wielding other heavy equipment may cause medial epicondylitis.

Learn more about Lateral and Medial Epicondylitis through our educational images: