Welcome to NeuroTalk:
There is another possibility:
Thoracic Outlet Syndrome: TOS
here is the link...
http://neurotalk.psychcentral.com/forum24.html
Some people who get wrist/ankle surgeries develop RSD afterwords. There are some British studies that showed using Vit C 1000mg for 50 days during the surgery and after, reduced this risk. It may be too late to do this for your husband, but since it is so benign...I'd try it anyway.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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