disarticulation vs obstruction

disarticulation

noun
  • The act of disarticulating. 

  • Some amputations: where a joint is disarticulated: e.g. knee, hip, elbow or shoulder disarticulation. 

obstruction

noun
  • The act of obstructing, or state of being obstructed. 

  • Something which obstructs or impedes, either intentionally or unintentionally 

  • The condition of having the natural powers obstructed in their usual course; the arrest of the vital functions; death. 

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