I cannot comment about this procedure but identify with the treatment options not there for your wife. I cannot take meds and had to find another way. I have has great success with a simple free, non med technique which is supported by good science. It works on the principle that the brain changes with chronic pain. The treatment works by retraining the brain that everything is ok. Souns far fetched but it is not. Google "mirro therapy for CRPS".
The US Army is trialling it for veterans with phantom limb pain at present.

In the UK a pharmacuitical company paid hundreds of thousands to put mirror boxes in pain clicnics throught Britain.
This might be worth considering

jeisea
http://www.crps-rsd-a-better-life.blogspot.com