A mallet finger is when the terminal extensor tendon avulses from the distal phalanx with or without a piece of bone, resulting in an inability to straighten the tip of the finger. A mallet injury can be classified into:

• A bony mallet, when the tendon comes off attached to a bony fragment called an avulsion fracture

• A tendinous mallet, where the tendon avulses by itself

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