Platelet Rich Plasma has been used for chronic golfer's elbow (medial epicondylitis) with success. The number of patients treated is much less than lateral. This procedure is not yet approved in the US but has been done in Europe and elsewhere. The technique is the same as lateral with a local anesthetic injection followed by a injection of 2-3 ml of buffered PRP. Please see Dr. Mishra's paper in the American Journal of Sports Medicine (Nov. 2006) for details.