patella vs scutum

patella

noun
  • The sesamoid bone of the knee; the kneecap. 

  • A little dish or vase. 

scutum

noun
  • The kneecap. 

  • One of the two lower valves of the operculum of a barnacle. 

  • A scute. 

  • An oblong shield made of boards or wickerwork covered with leather, with sometimes an iron rim; carried chiefly by the heavily armed infantry of the Roman army. 

  • A shield-like protection, such as the scutum protecting the back of a hard tick (cf. alloscutum, conscutum) 

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