It's unclear why the skeleton acts this way.It just does.
Is it millions of years of evolution, “Divine Design” or is it just a process of “natural selection”. For me it goes way beyond natural selection. The reason I feel so opinionated that this process is some sort of “Divine Intervention is because I believe that someday this process will prove to be a significant link to a human beings ability to gain complete control over self-healing. It hasn't been totally proven yet but just look and see what mysteries are about to unfold.