Steve,
Per discogram I'm concordant for pain at L4 and L5S1. I've an anular tear at L3 (non concordant for pain on discogram) and disc bulge at L4/L5S1, scar tissue encasing left S1 nerve root.
I've had a SNRB which did little altho my symptoms weren't so much of leg pain vs. low back pain, and ESIs performed various ways w/TF being of best relief for my particular spinal scenario.
Perhaps you should try this and see if it's helpful. To me the main point is relief~
there are some very helpful websites re these procedures. Check out
www.espineinstitute.com [url]www.spine-health.com and also
www.chirogeek.com has great spinal tutorial information that may be helpful.
Good luck either way with pain relief