--we could get you one of those vibrating chairs Melody's Alan likes so much?

Do you know how much of an electrical voltage is recommended in these bone growth devices? I assume we're talking non-implanted device (that would be covered by insurance).

Also, what about the ultrasound bone stimulation route? Have you seen anything on this for failed fusions? (I know there's a lot more on electrostim for that category of failed bone knit.)

I've been pulling up a lot of Internet stuff along these lines:

http://www.fchp.org/NR/rdonlyres/DAE...GrowthStim.pdf

--and the stuff on Spine Health and Spine Universe (which I imagine you've seen); but I can't seem to get specific references to ultrasound and spine, other than many insurance plans will not cover it, and I haven't been able to find sites that explain why or what contraindications are involved.