Mallet Finger 

A mallet finger is a deformity of the finger caused when the tendon that straightens your finger (the extensor tendon) is damaged. 

When a ball or other object strikes the tip of the finger or thumb and forcibly bends it, the force tears the tendon that straightens the finger. The force of the blow may even pull away a piece of bone along with the tendon. The tip of the finger or thumb no longer straightens. This condition is sometimes referred to as baseball finger.

Treatment 

The goal is to keep the fingertip straight until the tendon heals. Most of the time, a splint will be worn full-time for eight weeks.

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http://www.assh.org/handcare/hand-arm-conditions/mallet-finger#prettyPhoto

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Disclaimer : 

The material presented in this website is for educational purposes only. This material is not intended to represent the best or only methods or procedures appropriate for the medical situation discussed; rather the material is intended to present an approach, view, statement or opinion of the authors or presenters, which may be helpful, or of interest to other practitioners.