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Mallet Finger

A mallet finger, also known as a baseball finger or dropped finger, is caused by an injury to the extensor tendon on the back of a finger or thumb. The tendon attaches bone to muscle and is necessary for straightening the finger. If the tendon is damaged at the point of attachment to bone, just behind the fingernail, the ability to straighten the finger at the joint is lost and the fingertip will droop down. Often a small fragment of bone, and occasionally a large piece, will be torn off with the tendon at the time of injury.

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