A Rheumful of Tips Healthcare Palmaris Longusruptured thumb tendonsplint for thumb surgerysurgerythumb flexion #540 – Surgery for a Ruptured Thumb Tendon October 29, 2017 2 Comments While clicking Holly’s leash, things got out of hand. I heard a snap, then I was unable to flex my thumb. It could have been “#540 – Surgery for a Ruptured Thumb Tendon”