immobility vs tetraplegia

immobility

noun
  • The quality of not moving. 

  • The state or condition of being unable to change one's location, move or be moved. 

tetraplegia

noun
  • Paralysis of all four limbs. 

  • Complete paralysis from below the jaw. 

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