I have it too.the thing with fusions it keeps happening,alot people believe they go for a fusion and you are cured,after it fuses,if it does,they can go out and lick the world.go bowling,golf,etc.but the upper discs or lower can't take the pressure and they begin to go,rapidly for most.and ya back in again.I see some look horrible,very thin,fragile looking,walk like a board can't turn or bend,still in pain,how can you not be,they rip open your back,ruin your muscles,cut into nerves,they need to scrape meat away to get a bone graft.you not the same,never will be.Older ya get worse it becomes.But what gets me,you start with pain meRAB,go for surgery,still on meRAB,no end.Its nice to hear some fuse,they seem better,my doc told me an average fusion lasts 5 to 10 years before the next level neeRAB fixing.