Saw the spine specialist today, and what I've thought all along has the official M.D. stamp of approval. Ruptured L5-S1. Right now he's recommending no surgery, and just limiting athletics to what doesn't aggravate it. So far, cycling hasn't been a problem. I'm still not clear on what to expect in the coming months/years. I assume this won't get better on its own, but I'd love to know how fast it should be expected to get worse.