Yep, ibuprofen is an anti-inflammer, and it is said to be directly related to fusion failure. I would not take any over the counter meds without first speaking with your surgeon. I was told that I could take tylenol "occasionally".
BUT, FYI..I was one of the ones that HAD to go back on CELEBREX at week 10 I think it was.. due to uncontrolled swelling. I still fused and solidly at 7 months for one level posterior fusion at l4/l5. I got lucky.
Everyone is different, but had I not needed to be on the Celebrex, I certainly would not have taken it.
Just check with your doctor. Tammy