I was told by a chiro that i've got a L6-S1 natural fusion - he thought that the L6 simply never fully formed as in birth defect. Evidently some tall people have an extra lumbar vert. while some short people only have L4. But...i remember jumping off my trampoline as a teen, grabbing a tree branch and slipping, landing quite a ways down right on my butt and feeling 'jammed up' down there from then on. So maybe i actually did have a normal L6 but not after that. Always had pain down there when having to stand much. Hope it works out for you. "Search for Jehovah while he may be found." - and he won't be found in Christendom who took his name out their bibles over 7,000 instances. Get a bible study at JWorg