Years ago, when I first started with my back pain, before my hemilaminectory, I had cat scans, mri's and myelograms. None of these tests showed what was really wrong with my back. It wasn't until the surgeon opened me up and found all the problems.
To begin with, it was explained to me by the surgeon, that if a disc starts to dissolve, it can cause a chemical reaction to the sciatic nerve which can cause pain as well. Additionally, my surgery showed scar tissue that had strangulated the sciatic nerve causing it to be tethered and inflamed. (This was the result of a chymopapain injection, six months prior). This was not shown on any of the mri's or other tests I went through. Also, the foramen had to be widened as it was also causing the nerve problems by being too narrow to pass.
These are just a few things that happened to me that were the cause of my particular pain.
I wish you much luck.
Co-Moderator Chronic Pain and Fibromyalgia Forums
Believe in yourself. Be kind to fellow humans and animals. Take time to smell the flowers and the coffee.
And by all means, when you are down, ask me for help. I will be there.