In addition, jamming or hyperextension through routines that require catching or hitting an item may result in excessive stretching or tearing from the tendons. Repetitive strain from particular sports activities or functions may result in wear and tear, creating the tendons more vulnerable to injury. Scleroderma: This can cause calcifications https://www.theorthopaedicandpainpractice.com/why-cant-i-straighten-the-tip-of-my-finger/