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Mallet Finger Overview

Commonly an athletic injury, mallet finger occurs when the outermost joint of the finger is injured. Basketball and baseball players routinely experience jammed fingers, but the injury can occur because of a crushing accident on the job or even because of a cut finger while working in the kitchen.

With mallet finger, the tendon on the back of the finger (not the palm side) is separated from the muscles it connects.

Three types of injuries commonly occur:

  • The tendon is damaged, but no fractures (bone cracks or breaks) are present.
  • The tendon ruptures with a small fracture caused by the force of the injury.
  • The tendon ruptures with a large fracture.

Mallet Finger Symptoms

People with mallet finger may delay seeking medical attention -- even though they may be in a great deal of pain -- simply because they can still use their hand.

Symptoms may include the following:

  • Pain, tenderness, and swelling at the outermost joint immediately after the injury
  • Swelling and redness soon after the injury
  • Inability to completely extend the finger while still being able to move it with help

When to Seek Medical Care

Call a doctor immediately to evaluate the injury to determine the need for X-rays and to repair any deep cuts. The doctor may recommend an appointment with a hand surgeon for further evaluation.

Your doctor may also tell you to go to a hospital's emergency department for evaluation.

Exams and Tests

X-rays help the doctor know if the bone has a crack or break. Imaging studies may also help the doctor see any foreign debris in the cut.

Mallet Finger Self-Care at Home

  • If the finger is cut, clean the cut under running water for a few minutes. Then wrap the finger with clean gauze or a clean cloth. Apply a moderate amount of pressure to help stop any bleeding.
  • Apply ice to the injured finger joint to reduce swelling and tenderness. Wrap ice in a towel. Do not apply ice directly to your skin. A bag of frozen vegetables wrapped in a towel conforms nicely to the hand.
  • Take care not to injure the finger even more.


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