Hi,
If there is no history of injuries, We can look into his lifestyle. What is his occupation? IS he an athlete? If he is look into his technique of training, if he did any weights.

If not, As its a chrinic condition, continue the previous physical therapy and Avoid aggravating factors.

Also look for other causes or predisposing factors, such as bony abnormalities, labral pathology, and Wikipedia reference-linkradiculopathy.

Other Treatment (injection, manipulation, etc.):

Injection with anesthetic and corticosteroid into the biceps tendon sheath.

Myofascial trigger point injections in the parascapular muscles may be beneficial. This technique uses an injection with dilute local anesthetic.

Manipulation may be helpful, especially for first rib abnormalities that contribute to the syndrome.

Lithotripsy is under study for Achilles tendonitis and patellar tendonitis; the results are promising thus far. Studies on bicipital tendinitis are pending.

Educate the patient about using proper body mechanics to prevent recurrent injury (eg, pitching techniques, lifting techniques). Advocate regular stretching before and after exercise.

Cheers.