The first 10 vertebrae are fixed with their articulation to the thoracic cage.
they are planar joints, which do freely move connected by dense connective tissue to limit that movement. Just as when you fall on an outstretched hand, you are more likely to rupture a joint capsule that produce a collies fx. I amnt saying it can't or doesn't happen, it is not as common.
For some mechanisms that cause flail chest, especially motorcycle accidents, can cause forced hyperflexion of the thoracic spine.
since I was dealing with the MVA patient in this scenario, I was trying to acertain "what mechanism" was leading to the suggestion of a spinal injury for the purpose of determing if there was clinical reasoning or following a cookbook.
I still have this crazy idea that guidence works better than telling people how wrong or undereducated they are.
The american college of surgeons still considers gunshots to be the number 1 cause of spinal injury, whch may not damage the cage at all, but the scenario was not: "I think the patient was shot while driving."
I am not trying to suggest there are not times when the mechanism that fractures a cage also fractures the spine, the amount of rib fx without cord damage far outnumbers that with cord damage globally.
The anatomically narrow thoracic spinal canal also leads to a high incidence of associated neurologic complications. The higher the rib fxs the more chance of also finding spinal injuries. The younger the child, the more chance of spinal injuries since it takes great force to break the flexible ribs of the very young.
These patients will almost always get a CT scan to rule out organ damage and spinal fractures.