Hiya, unfortunately Wikipedia reference-linktennis elbow when chronic can be such a pain for physios and patients alike. The sad thing is that the modalities that have been mentioned above are designed to address inflammation mainly. Tennis elbow most recently has been identified as a tendinopathy rather than tendinitis which means that the shortwaves, the Ultrasound etc will not have much effect if there isnt any inflammation to battle. Moreover, there can be a strong resistance to treatment if the causative overuse activities are not concentrated on.The choice of friction massage is debatable because when done too deeply, there can be a mimicking of the overuse rub on bone making the condition worse. Other suggestions for treatment is injection therapy and the modification of activities that cause overuse. You can refer the patients who are resistant to treatment to a specialist in injection therapy,however you must monitor that the patient those not receive too many injection treatments due to the risk of steroid related joint anthropathies,infertility and osteoporosis.
My advice is to refocus your attention to the modification of activities because it is not likely the modalities mentioned above will be of much help, having said that not all patients will respond to treatment alike which means some may benefit from these modalities but treatment without investigating the causative activities in my opinion is useless as the condition is degenerative thats why it affects mainly adults in their thirties to fifties because they are quite active and have the natural degenerative processes begun already.

Modify your patients activities...