Mallet finger is an injury to the tendon that straightens the tip of your finger. When this tendon tears or pulls a piece of bone away from its attachment point, the fingertip droops and you can’t straighten it on your own. The result is the distinctive “mallet” shape: a fingertip that hangs down at the last joint while the rest of the finger stays straight.
How the Injury Happens
A thin tendon runs along the top of each finger, connecting the muscles in your forearm all the way to the bone at your fingertip. This tendon is what allows you to extend that last joint. Mallet finger occurs when a sudden force pushes the fingertip down while the tendon is trying to hold it straight. The tendon either stretches and tears, or it pulls off a small chip of bone where it attaches.
The classic scenario is catching a ball that strikes the end of an outstretched finger, which is why it’s sometimes called “baseball finger.” But it can happen just as easily jamming your finger while tucking in a bedsheet, pulling on a sock, or bumping your hand against a hard surface. Any forceful bending of the fingertip against resistance can cause it.
Tendon Tear vs. Bony Mallet
There are two types. A “soft tissue mallet” means the tendon itself has torn away from the bone. A “bony mallet” means the tendon stayed intact but pulled a fragment of bone off with it. Both produce the same drooping fingertip, and both are treated similarly in most cases. The distinction matters mainly for deciding whether surgery might be needed, since a large bone fragment can destabilize the joint.
What It Looks and Feels Like
The hallmark sign is a fingertip that droops and won’t straighten when you try to lift it. You can push it straight with your other hand, but the injured finger can’t hold that position on its own. Swelling, bruising, and pain at the last finger joint are typical, though some people are surprised by how little pain there is relative to how dramatic the droop looks. The ring finger and little finger are the most commonly affected.
An X-ray is usually taken to check whether a bone fragment came off with the tendon and, if so, how large it is. This helps determine whether the joint is still properly aligned or has shifted out of position.
Splinting: The Standard Treatment
Most mallet finger injuries heal without surgery. The treatment is a small splint that holds the fingertip straight, keeping the last joint in full extension or slight overextension. You wear this splint continuously for at least six weeks, 24 hours a day, without exception.
The critical rule: if the fingertip bends at all during those six weeks, the clock resets. Even briefly removing the splint to wash your finger and accidentally letting it droop can disrupt the healing tendon. When you need to clean the skin underneath, the fingertip must stay flat on a table or held straight by your other hand while you swap or adjust the splint.
After the initial six weeks, you transition to wearing the splint only at night and during activities that could re-injure the finger. This nighttime-only phase typically lasts another two to four weeks. If there’s no droop and the fingertip can hold its position against gentle resistance, you gradually wean off the splint over one to two weeks before returning to full activity.
How Well Does Splinting Work?
Success rates vary across studies, but the overall picture is encouraging. A systematic review in the Journal of Hand Surgery found that nonsurgical treatment produces results comparable to surgery for most injuries. Some studies report excellent or good outcomes in over 80% of patients, while others show more mixed results depending on how strictly patients followed their splinting schedule.
A small residual droop is common even after successful treatment. On average, patients who healed with a splint had about a 7 to 8 degree extension deficit at the fingertip, meaning the finger doesn’t quite reach perfectly straight. Surgery reduces that to about 5 to 6 degrees on average. The difference between those numbers is not clinically meaningful for most people, which is why splinting remains the first-line approach. Most patients don’t need specific exercises to regain bending ability afterward; normal use of the hand is usually enough.
When Surgery Is Considered
Surgery is reserved for specific situations. The most common reason is a large bone fragment that causes the joint to shift out of alignment (subluxation). When a fracture involves enough of the joint surface that the fingertip is no longer sitting properly in its socket, a splint alone can’t restore stability. In these cases, a surgeon pins the bone fragment back into place or uses other techniques to realign the joint.
Chronic mallet fingers that were never treated or failed splinting may also need surgical repair, though the results are less predictable the longer the injury has been present.
What Happens If You Don’t Treat It
Leaving a mallet finger untreated doesn’t just mean living with a droopy fingertip. Over time, the imbalance in tendon forces can cause a secondary deformity called “swan neck.” Here’s why: when the tendon at the fingertip stops working, the pulling forces redistribute along the finger. The middle joint begins to hyperextend (bend backward) while the fingertip stays bent down, creating an S-shaped curve. This affects grip strength, fine motor tasks, and can become painful. Correcting a swan neck deformity is significantly more complex than treating the original mallet finger injury, often requiring reconstructive surgery to rebalance the tendon system across multiple joints.
Living With a Splint for Six Weeks
The hardest part of mallet finger treatment is the splinting compliance. Six-plus weeks of continuous splint wear is genuinely inconvenient. The splint gets wet, the skin underneath gets irritated, and the temptation to “just check” whether the finger can straighten yet is real. A few practical tips make it more manageable.
Keep spare splints so you can swap a wet one for a dry one without exposing the fingertip. When changing splints, rest your hand flat on a table so the finger stays extended throughout the swap. Tape the splint securely but not so tightly that circulation is cut off. If the skin underneath becomes red or breaks down, your doctor can adjust the splint type or fit, but the finger still needs to stay straight.
The payoff for this discipline is real. Patients who maintain uninterrupted extension for the full treatment period have the best chance of regaining a straight, functional fingertip without surgery.