I have a case now in a 80 year old where the diagnosis from one neurologist was a distal ulnar problem but the guy also had from hospital: suspected small stroke; had slight spinal stenosis and a history of rightsided neck/shoulder problems. Otherwise "fit" having been active until now. After 7 weeks it's improved brilliantly. Gentle manual traction, gentle physiological rotation, ULTT with ulnar and median. Active mobilisation thorax/cervical, all that the previous writers have suggested but with care. No splints, but self mobilising to maintain ROM. If you haven't been treating too long yet don't give up, mine didn't seem to be getting anywhere then suddenly did!