crus vs shinbone

crus

noun
  • A leglike part; shank 

  • The shin (tibia and fibula) 

shinbone

noun
  • A segment of an insect's leg. 

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

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