Most of the time, it originates from a recurring movement or forceful use of your respective finger or thumb. Tendons are fibrous cords that attach muscle to bone. Each tendon is surrounded by a protecting sheath.  Actual physical Examination: The hand and wrist specialist examines the impacted region for symptoms https://www.theorthopaedicandpainpractice.com/why-cant-i-straighten-the-tip-of-my-finger/