Yes, I'm fused L2-L5 and about two years after the fusion I developed serious lower back pain. It may be SI, but I've had SI injections and they have now quit working. A SPECT done about two years ago showed active arthritis at the base of the spine and in the R S-I joint. I managed with steroid injections until about two years ago and have explored getting a spinal stimulator. Right now I'm awaiting a R hip replacement, so I'll see how much pain is left after that.