[mmglobal]

I don't know the approval status of the other spacers. Check out

http://globalpatientnetwork.com/devices

This is a work in progress... still a little lame, but you'll find x-stop, wallis, coflex there.

Here is an article about all of them:

http://www.spine-health.com/treatmen...rocess-spacers

One of the early Coflex surgeries I observed (back when it was still called the Fixano-U) was interesting because the surgeon didn't decide until he got in there, which device he'd use.

I wrote about it here:

http://www.adrsupport.org/forums/f51...pinous-u-7994/