The FDP tendons pass through the carpal tunnel deep to the FDS tendons, then split through the Camper chiasm in the fibro-osseous sheath to emerge through the FDS slips and continue to the distal phalanges. The FDP index finger is the only FDP that can act independently; the ring and middle FDP share a common muscle belly producing the dependent finger flexion that prevents true independent ring and little finger flexion. Jersey finger is the avulsion of the FDP from the distal phalanx during forced finger extension.
DIP joint flexion of all fingers; the deepest flexor tendon in each finger
Jersey finger (FDP avulsion from the distal phalanx) classically involves the ring finger during rugby or American football tackling when a jersey is grabbed and forcibly extended, avulsing the FDP tendon from the distal phalanx. Leddy-Packer classification guides urgency: Type I (retracted into palm with lost blood supply) requires repair within 7 to 10 days; Type II (at PIP level) within 3 months; Type III (bony avulsion) can be delayed.
FDP avulsion from the distal phalanx during forced finger extension producing DIP flexion inability managed with surgical reinsertion with urgency depending on retraction level.
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