© PANHANDLE ORTHO & HAND • Dr. Lisa Longhofer

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6907 John David Circle

Amarillo, Texas 79124

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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 (see Figure 1a and 1b). The force of the blow may even pull away a piece of bone along with the tendon (see Figure 2). The tip of the finger or thumb no longer straightens. This condition is sometimes referred to as baseball finger.

In a mallet finger, the fingertip droops: it cannot straighten on its own power. The finger may be painful, swollen and bruised, especially if there is an associated fracture, but often the only finding is the inability to straighten the tip. Occasionally, blood collects beneath the nail. The nail can even become detached from beneath the skin fold at the base of the nail.

MALLET FINGER

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