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The name “jersey finger” is derived from the common cause of injury, which is when a player’s finger is caught in an opponent’s jersey and forcibly extended during resisted flexion. (a) This results in rupture of the flexor digitorum profundus (FDP) tendon and, occasionally, an avulsion injury at the FDP insertion point on the distal phalanx. (b) As a result, active flexion of the distal interphalangeal (DIP) joint is no longer possible.
