11/24/2025
A Jersey finger makes a lot more sense when you understand how the flexor tendons actually work. The FDS bends the PIP joint, but the FDP is the one that runs all the way to the distal phalanx, which is exactly why it is the tendon that avulses in a Jersey finger injury. Once you see how these structures function together, the mechanics of the injury become clear.
Watch the full breakdown on my YouTube channel for a deeper look.
https://www.youtube.com/watch?v=3Xvra6y7AQE&t=7s