Cause:Forced extension of the distal interphalangeal joint
Pathophys:Rupture of flexor digitorum profundus or bony avulsion at FDP insertion onto distal phalanx
Sx:May be painless. History of forced extension. Often presents late
Si:Swelling and redness at distal interphalangeal joint (DIPJ), inability to actively flex DIPJ while middle phalanx immobilized. Do not test strength in flexioncan cause retraction of tendon into wrist and complicate surgery. Pain and/or palpable bony deformity on volar aspect of distal phalanx
Permanent DIPJ dysfunction if untreated. Refer to hand surgeon immediately. Delay leads to tendon retraction into wrist.