Hi Their,
I have RSD type 2 with nerve injury. I am 3 1/2 weeks post OP. I had to have a fusion from C4-7 the nerves were being pinched. I have heard severe nerve entrapment can cause this too.

Does he have any color changes at all?

I would make sure he gets a Spiral CT, this is more accurate than a reg. one.

Their is also a test called a Neurography. It is more better than a reg MRI because the nerves show up more.

I don't know what area you live in but you need a very very competant MD to get to the root of the problem. Before I ever go under the knife I get 3 opinions.

Also how long has your son been in this rough shape? Big Huge Hugs, Roz