Dear Terry:
Sorry to hear about your arm problem. It is alittle puzzling that the pain only occurs when you walk and not at other times when you are active. Let's suppose that it was a nerve from the cervical spine, then one would expect the pain to occur when you did similar motions, at what ever activity your engaged in. However, that doesn't happen. So, if was a nerve problem then you should see it at other times when your arm and shoulder are producing the same motion. I think I would lean toward not thinking this was a nerve problem. The only possibility that I can think of is if your ulnar nerve was mildly entrapped and by walking your aggrevating it. That might be detected by EMG. I would be more inclined to consider vascular etiologies. It only occurs when you exercise and your arm is actively moving. It may be that you have a narrowing of an artery or the way your shoulder sways? It is difficult for me to say over the internet. I am not sure why a tendonitis would cause pain in the shoulder and hand, but I am not an orthopedic surgeon.
Sorry, but I am abit baffled.
Sincerely,
CCF Neuro MD