Lisfranc Injury: Why It's Often Missed & What

Lisfranc Injury: Podiatrist’s Complete Guide to Diagnosis, Grading & Treatment

A Lisfranc injury can appear deceptively minor on initial X-ray — a small fleck of bone, a 1-2 mm joint space widening — yet cause years of chronic midfoot pain and arch collapse if not treated correctly from the start. This is the injury that ended professional athletes’ careers before imaging and surgical techniques improved enough to repair the damage reliably. In our clinic, we approach any midfoot injury with significant swelling and difficulty weight-bearing as a potential Lisfranc injury until proven otherwise.

What Is a Lisfranc Injury?

The Lisfranc joint complex encompasses the five tarsometatarsal (TMT) joints that form the articulation between the cuneiform bones and the bases of the five metatarsals. The Lisfranc ligament itself connects the medial cuneiform to the base of the second metatarsal and is the primary stabilizing structure of the entire complex. Lisfranc injuries disrupt this stability through three mechanisms: purely ligamentous (sprain to complete tear), bony (fracture at the joint complex without ligament tear), or combined (fracture-dislocation). The Myerson classification describes three types based on the pattern of displacement: Type A (total incongruity), Type B (partial incongruity), and Type C (divergent).

Lisfranc injuries occur in two broad contexts: high-energy trauma (motor vehicle accidents, falls from height) and low-energy mechanisms (plantar flexion loading with axial load — the classic “cleat stuck in turf” or “stepping off a curb wrong” mechanism in athletes). Low-energy Lisfranc injuries are more commonly missed because the deformity is subtle on standard X-rays.

Lisfranc Injury Symptoms

Characteristic clinical findings include:

• Midfoot pain and swelling — swelling centered over the dorsal midfoot rather than the ankle is the key distinguishing feature from an ankle sprain
• Plantar ecchymosis — bruising on the sole of the foot in the arch region is highly specific for Lisfranc injury (though not always present)
• Inability to single-leg heel raise — a positive single-leg heel raise test (inability to rise onto the ball of the affected foot) is sensitive for unstable Lisfranc injuries
• Tenderness at the Lisfranc joint line — focal tenderness directly over the 1st-2nd TMT joint
• Piano key sign — pain reproduced with dorsoplantar stress on individual metatarsal bases

How We Diagnose Lisfranc Injuries

Standard non-weight-bearing X-rays miss up to 20% of Lisfranc injuries. We obtain weight-bearing X-rays of both feet for comparison — a medial clear space (between the medial cuneiform and 2nd metatarsal base) greater than 2 mm compared to the contralateral side, or any TMT malalignment, is diagnostic. CT scan provides the most detailed bony anatomy for surgical planning, identifying subtle fracture lines and joint incongruity. MRI is the gold standard for pure ligamentous Lisfranc injuries — it directly visualizes the Lisfranc ligament, plantar TMT ligaments, and associated bone marrow edema.

Lisfranc Injury Treatment

Purely ligamentous Lisfranc sprains with demonstrated stability on stress X-rays are treated non-operatively: non-weight-bearing in a short-leg cast for 6 weeks, followed by protected weight-bearing and graduated return to activity over 3-4 months total.

Unstable Lisfranc injuries — demonstrated by any displacement on weight-bearing X-rays, or instability on stress testing under fluoroscopy — require surgical fixation. Surgical options include open reduction and internal fixation (ORIF) with plates and screws, and primary arthrodesis of the medial column (1st-3rd TMT joints). Evidence increasingly favors primary arthrodesis for ligamentous injuries and medial column involvement — randomized controlled trials show better long-term outcomes and fewer reoperations compared to ORIF with screw removal. Hardware is typically removed at 3-4 months after ORIF.

The Most Common Mistake We See

The most common failure is treating an unstable Lisfranc injury as a “bad sprain” and allowing weight-bearing in a boot. The unstable TMT joints settle into malalignment under load, resulting in midfoot arthritis, arch collapse, and chronic pain that is dramatically more difficult to treat than the original injury. When in doubt, non-weight-bearing until stability is confirmed with weight-bearing X-rays is the correct default.

Frequently Asked Questions

How long does a Lisfranc injury take to heal?
Stable sprains: 3-4 months to return to full activity. Surgical ORIF: 4-6 months. Primary arthrodesis: 6-9 months. Residual midfoot stiffness and aching with prolonged activity can persist for 1-2 years, particularly after more severe injuries.

Will I need surgery for a Lisfranc injury?
Only if the injury is unstable — demonstrated by displacement on weight-bearing X-rays or stress testing. Many mild Lisfranc sprains are stable and heal with non-operative management. The key is confirming stability with appropriate imaging before committing to a treatment approach.

Can Lisfranc injuries cause long-term problems?
Inadequately treated unstable Lisfranc injuries reliably produce post-traumatic midfoot arthritis within 3-5 years. Proper stabilization — whether non-operative for stable injuries or surgical for unstable ones — dramatically reduces this risk.

The Bottom Line

Lisfranc injuries are high-stakes diagnoses where missing instability leads to long-term midfoot arthritis and arch collapse. Any midfoot injury with significant swelling, plantar bruising, or difficulty weight-bearing needs weight-bearing X-rays as a minimum. When instability is confirmed, surgical treatment with ORIF or primary arthrodesis produces good long-term outcomes that non-operative treatment of unstable injuries simply cannot match.

Sources

• Weatherford BM et al. Lisfranc joint injuries. J Am Acad Orthop Surg. 2022.
• Henning JA et al. Primary arthrodesis vs ORIF for Lisfranc injuries. J Bone Joint Surg Am. 2020.
• Myerson MS. The diagnosis and treatment of injury to the tarsometatarsal joint complex. JBJS. 2018.