Mallet Finger: The Injury That Doesn't Hurt Enough | Form & Function MD
Clinical Depth

Mallet Finger: The Injury That Doesn’t Hurt Enough

Form & Function MD · Dr. Ben, MD

Dr. Ben, MD · Orthopaedic Hand & Upper Extremity Surgeon

Every holiday season brings the same patient: a backyard football game, a pass caught badly, a jammed fingertip that now droops. It doesn't hurt much, so they wait a week or two. Mallet finger is one of the few hand injuries where the treatment is simple, effective, and completely unforgiving of shortcuts.

What happens

The tendon that straightens the last joint of the finger (the DIP joint) attaches to the base of the fingertip bone. When a ball or other object strikes the tip of a straight finger, the force jams the tip down and can tear that tendon or pull off a small flake of bone where it attaches.

The result is a fingertip that droops. You can push it straight with your other hand, but you can't hold it straight on your own. It's also common to bump a finger while tucking in a sheet or pulling on a sock and end up with the same injury.

You can push it straight. You just can't hold it there. That's the whole diagnosis.

Why people wait, and why that's a problem

Mallet finger usually isn't very painful. There may be some swelling and tenderness over the back of the last joint, but many people assume it's a jam that will settle. Treatment is most straightforward when it starts early, though even injuries a few weeks old often still respond to splinting.

Left untreated, the fingertip can stay permanently bent, and over time some people develop a swan-neck deformity, where the middle joint over-straightens to compensate.

Treatment: the splint is the treatment

For most mallet fingers, including many with a small bone fragment, the treatment is a splint that holds the last joint fully straight, or very slightly over-straightened, while the middle joint stays free to bend. The tendon needs to heal in that position without interruption.

The splinting protocol
  • Continuous wear for about six to eight weeks — day and night, in the shower, without exception.
  • Then several more weeks of wear at night and during higher-risk activities, as your surgeon directs.
  • To clean or change the splint, keep the finger flat on a table so the tip never drops.
  • If the fingertip bends even once during the continuous phase, the healing tendon can be pulled apart. That's why the timeline is usually restarted.
Bend it once to check, and the clock resets. The discipline is the treatment.

Skin under the splint needs attention. Check for redness or pressure spots over the back of the joint, and keep the skin dry. Your surgeon or hand therapist may adjust the splint type if the skin becomes irritated.

When surgery is considered

Surgery is the exception. It's considered when a large portion of the joint surface comes off with the bone fragment, or when the fingertip bone has shifted out of alignment with the joint on X-ray. It's also an option for people who can't wear a splint reliably, such as some surgeons or other workers who need their hands free, though splinting remains the standard for most.

Signs this needs an X-ray and exam
  • Any drooping fingertip after an injury — an X-ray shows whether bone is involved
  • Significant swelling, bruising, or pain at the last joint
  • A visible step or deformity at the joint
  • An injury that's already a few weeks old
Bottom line
A fingertip that droops after a jam deserves a splint and an X-ray, ideally within days. Wear the splint exactly as instructed, without taking it off to test the finger. Most people heal well with nothing more than that.

This article is for education, not a diagnosis. If something here sounds like you, see a physician who can examine you.

  1. Bendre AA, Hartigan BJ, Kalainov DM. Mallet finger. J Am Acad Orthop Surg. 2005;13(5):336–344.
  2. Handoll HH, Vaghela MV. Interventions for treating mallet finger injuries. Cochrane Database Syst Rev. 2004;(3):CD004574.