Broken Stegosaur tailspike

[Larry <dunn1@idt.net>]

If Stegosaurus stenops broke off half of one of its tailspikes, say, 
defending itself (humor me here for a moment, those of you who don't 
believe it was a weapon), what would the break look like?  Would it break 
clean off or would it splinter along the length of the spike?  I'm 
looking for you to "draw me a picture."  Was there a sheath of something 
over bone?  Would it have bled profusely or broken off clean?

Thanks,
Larry