Treatment of tennis elbow:

This is a very common condition, but actually it is not related to the elbows themselves.  The cause is the squeezing of the nerves by an abducent muscle called the supinator, which tightens up when the forearm is extended (extensor muscle) or rotated outward, or by inflammation of the tendons around the elbow.

In clinical reports in the U.S. and Europe, it is indicated that the symptoms have been alleviated in more than 50% of patients by injecting Botox into the muscles.