Hi Carrie,
I've had 3 neck surgeries in 10 years and have had bone grafts from my hip all 3 times. The 1st time was a little painful but the other 2 were not bad at all. I didn't even need pain meds after my last surgery. It will be 1 year Sunday. The surgeon actually used crushed coral to fill in the area on my hip the last time.
A word of caution though. Don't make any sudden movements like twisting or bending real fast for a few weeks or you will probably feel pain. If I had to do it again I would choose bone graft again.
Good Luck,
Frank