Ryan Fitzpatrick, the New York Jets starting quarterback, tore the ulnar collateral ligament (UCL) of his left/non-throwing thumb during a scramble Week 8. The UCL is the ligament that stabilizes the metacarpophalangeal (MP) joint of the thumb during pinching and gripping. When the UCL is torn, the MP joint becomes unstable, and the ability to grip and pinch with force is lost. This has been...