Closed tendon injuries

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Jersey finger

• Affected tendon: flexor digitorum profundus (FDP); most commonly in the ring finger
• Mechanism of injury
  • Sudden hyperextension of a flexed DIP joint (forced extension) → avulsion fracture and/or rupture of the FDP tendon at the insertion
  • Often seen when athletes grab an opponent’s jersey
• Clinical features
  • Pain, swelling of the DIP joint (palmar aspect)
  • Extension of the DIP joint at rest
  • Inability to flex the DIP joint