I would totally concur with Wutti 's comments. In chronic cases of Wikipedia reference-linktennis elbow the tendon has been shown to be degenerative and acutely inflammed. The evidence base to support the use of ultrasound and manual techniques in chronic forearm tendonopathies is very poor. The most evidenced based form of treatment is progressive eccentirc extensor loading and extensor stretches, there is also reasonable evidence to support the use of a forearm clasp. Clinically i have foud these methods to be beneficial, however i would suggest that there is an element of natural lifespan to this pathology.