hammer finger

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one of the five digits of the hand.
baseball finger mallet finger.
clubbed finger one affected by clubbing.
hammer finger mallet f.
index finger forefinger.
mallet finger partial permanent flexion of the terminal phalanx of a finger caused by a ball or other object striking the end or back of the finger, resulting in rupture of the attachment of the extensor tendon. Called also baseball or hammer finger.
webbed f's syndactyly of the fingers.

mal·let fin·ger

an avulsion, partial or complete, of the long finger extensor from the base of the distal phalanx, resulting in the inability to fully extend the distal interphalangeal joint actively.

hammer finger

Etymology: AS, hamer + finger
a permanently flexed terminal phalanx caused by an injury to the extensor tendon. Also called mallet finger.
A flexion deformity at a 30º angle of the distal phalanx, produced by a blow to the tip of the finger, which in the US is most typically the result of catching a baseball thrown at high speed, resulting in the forced flexion of the distal phalanx and a separation fracture—by rupture or avulsion—of the common extensor tendon from its insertion in the base of the distal phalanx, accompanied by an inability to extend the fingertip