Laceration of Tendons
Mallet finger is the injury resulting from laceration or rupture of the extensor tendon over Zone I, the distal phalanx, or distal interphalangeal joint. This injury causes the distal interphalangeal joint to be flexed at 40 degrees. It is the most common tendon injury in athletes.
Swan neck deformity may result from chronic untreated Mallet finger.
Boutonniere deformity results from an injury in Zone III over the proximal interphalangeal joint. Injury of the central tendon and disruption of the lateral bands allow flexion as well as the flexor digitorum profundus to function unopposed. There is retraction of the extensor hood and resultant extension of the metacarpophalangeal and distal interphalangeal joints. Gamekeeper’s thumb is the rupture of the ulnar collateral ligament. This occurs as the result of radial deviation of the metacarpophalangeal joint.
Mallet finger is the injury resulting from laceration or rupture of the extensor tendon over Zone I, the distal phalanx, or distal interphalangeal joint. This injury causes the distal interphalangeal joint to be flexed at 40 degrees. It is the most common tendon injury in athletes.
Swan neck deformity may result from chronic untreated Mallet finger.
Boutonniere deformity results from an injury in Zone III over the proximal interphalangeal joint. Injury of the central tendon and disruption of the lateral bands allow flexion as well as the flexor digitorum profundus to function unopposed. There is retraction of the extensor hood and resultant extension of the metacarpophalangeal and distal interphalangeal joints. Gamekeeper’s thumb is the rupture of the ulnar collateral ligament. This occurs as the result of radial deviation of the metacarpophalangeal joint.
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