Ribs don't misbehave unless they are traumatised. The same cannot be said for intrevertebral joints and their associated nerves. protective responses are the root cause of spinal pain , normal behaviour of Wikipedia reference-linkfacet joints ( movements ) are not generally associated with inflammatory events and pain, protected behaviour is. It is the everyday business of my clinical life over more than twenty years to turn off protected spinal responses and return pain free movement, in that time I have yet to come across a rib that misbehaved, plenty that were sore because of referred pain from facet joints however. The odds of ribs going wrong are infinitely small, compared to the strong likelihood of facet joint/nerve involvement.