I live up by Chicago, and watch the news daily.
Yesterday on news was a interesting news article on this topic.
Go to "abc7chicago" on the internet, and when you get to the website, on left side of page click the link for "healthbeat",
then click on link for this topic, interesting stuff.
I am not member, just passing this on.
They talk about reverse fusion and putting in a artifical disc.
Some might be interested, just passing it on.