I found out this when I had my laminectomy, I have a extra vertabrae in my back, its not uncommon. My new doc was saying my L4-L5 was bad and I was like isn't it where I had the laminectomy and he said yes, I was like thats L5-S1, because of my former doctors told me. I'm just a patient I don't know anything. lol. Anyway he looked at my X-rays then and "What do you know, you do have a extra vertabrae". L4-L5 became L5-S1 again to my relief. I thought i had 2 bad discs for a second.
Also he made real sure on the date of the surgery to mark where he was going to operate.
Anybody else got a extra vertabrae?