canon bone vs shinbone

canon bone

noun
  • The shankbone, or great bone above the fetlock, in the fore and hind legs of the horse and allied animals, corresponding to the middle metacarpal or metatarsal bone of most mammals. 

shinbone

noun
  • The inner and usually the larger of the two bones of the leg or hind limb below the knee 

  • A segment of an insect's leg. 

How often have the words canon bone and shinbone occurred in a corpus of books? (source: Google Ngram Viewer )