There are only two things that surgery can do. Surgery can decompress a nerve root or it can stabilize a painful motion segment. So we have to identify a nerve root that's pinched or we have to identify a painful motion segment. And if we can do that, that would make you a candidate for surgery. Just having pain and having failed conservative treatment is not an indication for surgery if there is no pathological cause of the pain - it doesn't mean there's not pain, but we have to identify the cause of pain in order to be able to correct it. The only thing surgery can do is actually correct an anatomical defect, so we have to be able to identify it.