The results from my MRI showed that I had Disc degeneration and a mild disc bulge, thus resulting in the L4-S1 fusion being required to fix this area and rid me of pain (inserting two metal rods and bolting them to my spine), I use to get pins and needles down my right leg and numbness all the time as the bulge pushed ever so slightly on the nerve. The surgery was successful and I no longer have any back pain,numbness or pins and needles down my right leg

I have had only one operation

Hope this helps!

Cheers
Mike