Your symptoms are so similiar to mine.
Fusion s1/s2 w/o hardware (Leg Pain) - 1982
Laminectomy L5 - (Leg Pain) - 2006
Fusion L5/S1 w/ hardware - (Leg and Back Pain) - Feb 2007
Revision L5/S1 w/ removal of right side of hardware
with Laminectomy of L5, L4, and L3 (Leg and Back Pain) - Nov 2007
To diagnose whether the Hardware was my problem, they did a mylegram and saw the screw laying close to a nerve then they did a nerve block of the hardware. My pain went away for 3 hours after the block then the pain came back with a vengenance. This is a postive nerve block meaning the hardware was the source of my pain. I had the block done last September and then had the revision done this past November. Unfortunately I still have back pain and leg pain. They are saying I probably now have failed back syndrome and I continue to pray that it is still early out and the LORD will heal me.
I hope this helps and please feel free to ask any questions. I love to chat.