My wife (who has RSD) has had at least 2 EMG to check for trapped nerves. Why so many is beyond me. She dreaded the tests but she seemed to deal with it ok and said the last one wasn't too bad.

I have read of RSD cases where the patient had all or most of the signs of RSD and in one case in particular the patient was treated for RSD for several years, as I recall, until they found a trapped nerve. They removed or untrapped the nerve which cured all symptoms. This patient used to post on this RSD forum.