Hey, my daughters pain doc just told us about the PSTIM he's starting to offer, and we're considering that over an implanted unit. There doesn't seem to be a lot on the net about them that isn't company sponsored, but he's already started the treatments for 2 patients (car accident victims), and we're seeing how it goes before deciding.

http://www.eagleadvancementinstitute.com/pstim/Overview.asp

Please note this isn't information from someone who has had one, just a heads up that there may be less invasive products out there to consider? Hope all goes well no matter how you decide to go, pain relief is so critical to quality of life.