Ok, so I have grade 2 spondy at L5-S1...have had it for most of my adult life (I'm 43yo). I just had an updated MRI (open) on my lumbar spine, and it indicated severe degenerative changes in the disc at that level. My previous MRI (done a year and a half ago) showed very little to no disc height left at L5-S1, so I'm guessing that it's pretty much bone on bone right now. When looking at the MRI images and also at x-rays that I've had done...the vertebral slippage is clear as day (quite freaky-looking if I might add). My question has to do with more of a physical deformity (for lack of a better term) in my lower back area. I have a fairly large boney protrusion in the L5-S1 region. It's more prominent when I bend forward...it literally sticks out through my clothing...I jokingly tell people that it's my "tail". }:) But in all honesty, it can be quite painful...especially lying on rigid, flat surfaces. Even well-padded gym benches bother me. I find that I have to use a folded over yoga mat, to cushion that boney protrusion...otherwise it's excruciating. I've been told that this boney protrusion is actually my S1...however, after looking at my MRI images...I'm not convinced. Nowhere on the images, does it look like my S1 is even close to protruding as much as it does. Do any other spondy sufferers have a similar boney protrusion on their lower back? Does this sound like it is my S1, as I've been told? If not, what else could it possibly be? I've had this boney protrusion for as long as I can remember...even before I became symptomatic from my spondy. Thanks for any insight!