I am having pain rated about 9 from middle of both buttocks to behind my knees. its only skin pain. like touching it with a feather. No pain in muscles or bones. ER did a cat scan of both hips. Right hip was replaced 10 yrs. ago next week and bilateral total knees 2 years ago. I have a history of lower back pain and pain radiating down both legs, since age 16 yrs, My parents, brother, and 2 daughters have had back fusions done. I fell this AM down to my knees and then face. Could this be from a bad vertebrae ?