Mallet finger happens when the fingertip is forcibly bent — jamming a ball, catching a sheet, reaching into a pocket. The extensor tendon ruptures and the tip droops. Treated correctly and consistently, most mallet fingers recover fully — often with better extension than most patients expect.
Timing matters. Seek evaluation promptly — the sooner splinting begins, the better the outcome. Chronic mallets (>6 months) may require surgery.
Understanding the Injury
The DIP joint — the end joint of the finger — is held in extension by the terminal extensor tendon, which inserts on the dorsal surface of the distal phalanx. When the fingertip is struck and forcibly flexed against resistance, this tendon is put under sudden, extreme tension. It either ruptures mid-substance (tendinous mallet) or avulses a fragment of bone from the distal phalanx at its insertion (bony mallet).
In both cases, the result is the same: the finger can no longer actively extend the DIP joint. The tip droops, typically at a 20–40 degree angle, and the patient cannot straighten it on their own. Passive straightening — using the other hand — is still possible, which confirms that the joint itself is intact and the problem is the tendon.
The mechanism is usually mundane. Catching a ball, tucking in a sheet, reaching into a tight space. The injury does not require high energy — even the force of a pillow case has been enough to create a mallet finger. Athletes and non-athletes alike present with this injury.
The treatment window matters. A tendinous mallet finger treated within days to weeks of the injury responds well to splinting. A mallet finger left untreated for months gradually stiffens, the tendon retracts, and the window for conservative management closes. Beyond six months, surgery is typically the appropriate path.
Left: Normal extensor tendon (green) keeping the DIP joint extended. Right: Ruptured terminal extensor tendon causing the characteristic fingertip droop of mallet finger.
The PIP joint — the middle joint of the finger — is not involved in mallet finger. Full PIP motion is preserved and the PIP joint is never splinted.
Two Types — Different Treatment
The distinction determines whether you go in a splint or into the operating room. An X-ray at your first visit answers this question immediately.
The extensor tendon heals by forming a fibrous connection across the rupture while held in continuous extension. This process takes six weeks. If the DIP joint flexes — even once, even for a second — the healing connection is disrupted and the six-week countdown starts over. There are no exceptions to this rule.
The DIP joint must not flex at all during the full-time splinting phase. Not to wash the finger, not to check how it's healing, not for any reason. If it flexes, the clock resets.
When changing or cleaning the splint, the DIP joint must be actively held in extension by the patient — never allowed to droop. This is a technique Dr. Graham's team teaches at your first visit.
With mallet finger, the splint is not an accessory to treatment — it is the treatment. How well you wear it determines how well you heal. This is one reason Dr. Graham uses a custom-fitted orthoplast splint.
Dr. Graham's Approach
The standard advice for mallet finger is to wear a stack splint — the plastic finger splint available at any pharmacy — for six to eight weeks. This works. But in Dr. Graham's experience, it is not the best option.
Dr. Graham fits every mallet finger patient with a custom thermoplastic (orthoplast) splint, fabricated by his hand therapy team to hold the DIP joint in hyperextension — not just neutral extension. This subtle but important difference in positioning places the extensor tendon at its optimal length for healing and maximizes the tension across the repair site.
The result, in Dr. Graham's experience, is that many patients achieve full or near-full return of DIP extension — results that significantly exceed the commonly cited expected 20-degree extensor lag. This is not the outcome patients are typically told to expect when they show up at an urgent care with a stack splint and a pamphlet.
The custom fit also matters for compliance. A well-fitted orthoplast splint stays on, stays comfortable, and maintains the correct position. An ill-fitting stack splint migrates, irritates the skin, and gets removed — and every removal risks resetting the clock.
The Splinting Protocol
The protocol is straightforward. The commitment is significant. Both are non-negotiable for a good outcome.
X-ray confirms tendinous vs. bony mallet. Custom orthoplast splint fabricated in hyperextension. Technique for splint changes taught in clinic. Clock starts today.
Splint worn at all times — sleeping, showering, working. DIP joint must not flex at any point. If it droops even briefly, the 6-week clock resets from that day.
Splint worn during sleep and high-risk activities. Gradual return of daytime hand use. Finger is monitored at follow-up visits to confirm extension is holding.
Splint is discontinued once healing is confirmed at 12 weeks. No formal therapy required for most patients. Extension is assessed and documented at final visit.
Surgical Treatment
When a bony mallet fracture involves a large fragment — typically more than one-third of the articular surface of the distal phalanx — or when the distal phalanx has subluxated volarly (shifted toward the palm) at the DIP joint, splinting alone is not sufficient. Joint congruence must be restored surgically to prevent long-term arthritis and dysfunction.
Dr. Graham performs open reduction and internal fixation for these cases — directly visualizing the fragment, repositioning it anatomically, and securing it with small pins. The DIP joint is held in extension during healing. Recovery after surgical fixation involves a period of pin protection followed by gradual mobilization once healing is confirmed on X-ray.
Digital or wrist block. Most cases performed under regional anesthesia only — sedation available on request. Outpatient procedure.
Small incision over the dorsal DIP joint provides direct visualization of the fracture fragment and joint surface.
The avulsed bony fragment — with attached extensor tendon — is repositioned to its anatomic location on the dorsal distal phalanx.
The fragment is secured with small Kirschner wires (K-wires). A transarticular pin may also be placed to hold the DIP joint in extension while healing occurs.
Pins are typically removed in clinic at 6 weeks once X-ray confirms healing. Gradual DIP mobilization begins at that point under Dr. Graham's direction.
Delayed Presentation
Many patients arrive having noticed the drooping fingertip for some time — dismissing it as a minor jam, hoping it would resolve, or not realizing it required treatment. The timeline of the injury determines the options.
In Dr. Graham's experience, patients presenting within 6 months of a tendinous mallet finger can still be treated with splinting — the window is longer than many expect. The tendon has not fully retracted and healing remains possible with consistent splinting from the time treatment begins.
Beyond 6 months, the soft tissue has typically contracted and the tendon cannot be brought back to length with a splint alone. At that stage, surgical options are considered — including a tenodermodesis procedure or DIP fusion in selected patients with significant functional limitation.
Optimal window. Custom orthoplast splinting begins immediately. Best chance of full extension recovery.
Still an excellent candidate for splinting. Outcome remains very good with strict compliance. Do not delay further.
Splinting still offered and often successful. Outcomes may be slightly less predictable than acute treatment but remain worthwhile.
Splinting is unlikely to be effective. Surgical consultation appropriate. Options depend on degree of lag, patient symptoms, and functional demands.
"Dr. Graham called me the evening of my surgery to check in personally. That kind of care is rare. He explained everything clearly, the team fitted me with a custom splint, and my finger healed better than I was told to expect."
Common Questions
What patients ask most often — at 11pm after it happens, and at their first visit.