No you're onto something. When you take light injuries like bruises to the shin bone, it causes microfractures that fill in with rock-like calcium. Doing that many times on one spot can grow a bump or mound of bony calcium. It's how and why kickboxers condition their shins. I have a few small distinct humps on each shin bone in the most common impact places, with vwry little nerves or sensation. Anyone who hits their shins on furniture or bike pedals on the regular probably does too. You can do it with just about any bone as far as I know. Bone conditioning is some real human Tyranid type shit