New onset leg pain after surgery in my practice warrants a new MRI. Yes, BMP is irritative to a nerve root and can cause this pain but mechanical compression has to be ruled out. This includes cage displacement, hardware malposition, hematoma formation as well as BMP irritation.
BMP irritation seems to be successfully treated with a steroid injection or two but only after the cause of the irritation is diagnosed.
I allow my patients to use NSAIDs after three months for any fusion but I cannot comment on your surgeon’s protocol.
Dr. Corenman