Did you have a 360 the first time?
I was at higher risk for non-fusion because I had so many levels done. My surgeon did the 360 method, used BMP and donor bone, and gave me a bone growth stimulator. I was showing bone growth at only 6 weeks post op, and I was fully fused at 6 months. The 360 method has a higher success rate than just going in from either the front or the back alone. The BMP also has a good track record, and the bone growth stimulator, well, it can't hurt!
If you smoke, this would be a good time to quit. I've also read that diet soda can interfere with the fusion process, though I don't know why.
I hope this will be your time! You already know the drill: rest and walk, rest and walk, rest and walk. How are you doing? Hanging in there?
Let us know...
Blessings,
Emily