Most of the time, it comes from a recurring movement or forceful use of the finger or thumb. Tendons are fibrous cords that connect muscle mass to bone. Each and every tendon is surrounded by a protecting sheath.  Crepitus or Grinding Sensation: This requires a grinding or clicking sensation from https://www.theorthopaedicandpainpractice.com/why-cant-i-straighten-the-tip-of-my-finger/