Most of the time, it originates from a repeated movement or forceful use of the finger or thumb. Tendons are fibrous cords that connect muscle mass to bone. Each individual tendon is surrounded by a protecting sheath.  Make House Modifications to Prevent Falls: Very simple household modifications like removing tripping https://www.theorthopaedicandpainpractice.com/why-cant-i-straighten-the-tip-of-my-finger/