I have never heard of it.😀

Forgive me but I don't think I ever responded to you... The way my surgery was performed isn't done like that anymore. They removed extensive bone from my top 3 vertebrae in my neck which today they only remove bone from the top vertebrae in your neck. That would explain my neck pain and instability I now have.. I refuse to go back to the same hospital that performed it because I feel that they only compounded my original problem. My insurance won't pay for me to seek treatment out of state so I'm stuck

I am not familiar with this surgery. You said you had it 15 years ago, are there advancements or studies you are aware of since you had surgery?

I have never heard of this what is it and what does it do?

I've got to look into this. I had enough head trauma through childhood through my twenties to fill an encyclopedia, including car accidents (hitting the windshield at 10 and whiplash at 16.) I doubt gymnastics helped either.
Interesting that none of my headache docs asked about head or neck injuries.