canon bone vs tibia

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. 

tibia

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

  • The third segment from the end of an arachnid's leg, between the patella and metatarsus. 

  • The second segment from the end of an insect's leg, between the femur and tarsus. 

  • A musical instrument of the flute kind, originally made of the leg bone of an animal. 

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