Lisfranc Injury

Overview

what it is and why it matters

The Lisfranc joint is the row of joints in the middle of your foot, where the long bones of the forefoot meet the cluster of small bones in front of the heel. A Lisfranc injury is damage to the ligaments holding those joints together; severity ranges from a subtle sprain you can almost walk off, to a dramatic fracture-dislocation. These are notoriously easy to miss, and even a "subtle" tear leads to progressive midfoot arthritis and lasting disability if it's not recognized and treated. The common mechanisms are a car pedal driving back into a downward-pointed foot during a crash, or a seemingly minor twist (like stepping off a curb wrong).

The classic subtle presentation is a midfoot sprain that just doesn't improve. A telltale sign, bruising on the bottom of the foot along the arch, is highly suggestive of a Lisfranc injury and should never be ignored; weight-bearing X-rays are still needed to confirm it.

Symptoms

what you may notice

Pain across the top of your midfoot that is sharply worse when you try to stand or push off your toes is the most common complaint. The midfoot swells quickly, and even light pressure over the joints in the middle of the foot is painful. The hallmark sign is bruising on the sole of the foot along the arch, plantar ecchymosis, which strongly suggests a Lisfranc injury and should never be dismissed as a simple sprain.

In more severe injuries the foot may look wider or flatter than normal as the joints spread apart. Weight-bearing becomes very difficult or impossible. Some patients describe a "click" or shift in the midfoot with each step. Pain often worsens over the first day rather than improving, which is a red flag that the injury is more than a routine ankle or foot sprain.

Diagnosis

exam first, imaging second

X-rays taken lying down (non-weight-bearing) often look completely normal, which is why these injuries get missed. Standing X-rays of the foot are essential: a small gap between the bases of the first two long foot bones confirms the diagnosis. A CT scan shows the bone in detail, and an MRI is best for finding ligament tears when the bones still look normal. Bruising on the arch on exam should always prompt this workup.

How We Treat It

what we try first, and when surgery is needed

The most important thing to know is that treatment turns on one question: have the midfoot joints stayed in place, or have they shifted? A purely ligamentous injury that has not moved can sometimes heal without surgery. Any joint widening or instability changes the plan. Here is how we approach the non-operative route.

Non-Operative Care

Non-Weight-Bearing Cast

Purely ligamentous injuries in low-demand patients without any joint widening can sometimes be managed with a period of no weight-bearing in a cast and very close X-ray follow-up to make sure nothing shifts. The follow-up X-rays matter as much as the cast, because if the joints start to move apart, the plan changes to surgery.

Surgical Options

if non-operative care isn't enough

Any joint widening, any fracture-dislocation, or any ligament injury with demonstrated instability in an active patient needs surgical stabilization. The procedure either holds the joints together with screws or fuses them, the choice depends on how much the ligaments and joint surfaces have been damaged.

Frequently Asked

questions we hear in clinic

I just have a midfoot sprain that won’t get better. Could it be a Lisfranc injury?

It can be. The classic subtle Lisfranc injury looks like a midfoot sprain that simply doesn’t improve. Because these injuries are easy to miss, a sprain that lingers is worth a closer look, especially if there is bruising on the bottom of the foot.

What is the one sign I shouldn’t ignore?

Bruising on the sole of the foot along the arch (called plantar ecchymosis). It strongly suggests a Lisfranc injury and should never be dismissed as a simple sprain. If you see it, the foot needs to be evaluated.

My X-ray looked normal. Does that rule it out?

Not on its own. X-rays taken lying down often look completely normal, which is exactly why these injuries get missed. Standing (weight-bearing) X-rays are essential: a small gap between the bases of the first two long foot bones confirms the injury. CT and MRI add detail when needed.

Do I need surgery?

It depends on whether the joints have moved. A purely ligamentous injury with no joint widening, in a low-demand patient, can sometimes be treated without surgery using a non-weight-bearing cast and close X-ray follow-up. Any joint widening, any fracture-dislocation, or instability in an active patient needs surgical stabilization.

Why does treating it early matter so much?

Even a subtle, untreated tear can lead to progressive arthritis in the midfoot and lasting disability. Recognizing and treating the injury early is what prevents that long-term damage.