Mallet finger (zone I):
- Lesion of bony or ligamentous attachment of extensor mechanism at DP with loss of extension at DIPJ
- Mechanism: tip of finger struck by or against object resulting in acute DIPJ flexion
- Treatment: splinting with DIPJ in extension
- Untreated mallet finger progresses to Swan-neck deformity
Injuries at zone I (DIP joint) may provoke disruption of the terminal extensor tendon, which is dorsally and superficially located at this level.
This type of lesion is called mallet finger and is characterized by a deficit of DIP joint extension.
A mallet finger injury may be open, but the closed type is more frequent.
The mechanism for the closed injury is most commonly sudden, forceful flexion of the DIP joint in an extended digit.
This results in the rupture of the terminal extensor tendon or the avulsion of a bone fragment at its insertion. The most common treatment is closed splinting with the DIP joint in extension.
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