The perichondrium is richly vascularized and supplies the avascular ... In severe cases in which most of the ear cartilage has been lost, cartilage from the rib can be used to reconstruct the ...

Floating rib injuries are caused, in part, by a vulnerability in human anatomy. The rib cage, which is made up of 12 pairs of ribs, doesn't fully attach to other bones in the same way at all points.