Bone out of place picture
This is a picture from the Educational DVD showing a simple version of a bone out of place in a direction the body cannot self-correct because it has no muscles pulling in the direction needed and the compensations the body will make to cause midback pain, neck pain and headaches that have nothing to do with the neck and head.
It is the reason that headaches return even after manipulation or massage or other soft tissue work and explains how to correct them so they will not return.