What a Lisfranc injury is
The Lisfranc (tarsometatarsal) joints are where the long foot bones meet the small bones of the arch, in the middle of the foot. Strong ligaments hold them, but there is none between the bases of the first and second metatarsals, so a twisting fall can tear ligaments, break bones or shift the joints. Injuries range from a sprain of one joint to a complete dislocation of the midfoot.
The midfoot barely moves: it holds the arch firm for pushing off, which is why an unstable injury left untreated can let the arch collapse. The injury is named after a French surgeon in Napoleon's army.
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Who gets it, and how
Low-energy injuries come from a simple twist and fall, or in football and rugby when another player lands on the back of a foot pointed down; high-energy ones from a fall from height, a road crash or a crush. Lisfranc injuries are uncommon, under 1% of all fractures.
In Oslo, the rate was 14 per 100,000 people a year and 69% were low-energy injuries; unstable injuries were commoner in women. In Sweden's fracture register (2,084 injuries), tripping was the commonest cause, about 1 in 5 were high-energy, and 39% had surgery.
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How it's recognised, and why it's missed
Signs are a swollen, painful top of the foot, bruising on the top and especially the sole, and pain in the midfoot on standing, walking or pushing off, sometimes too much to take weight. Clinicians check for tenderness across the midfoot, pain when the forefoot is twisted or the toes are moved up and down, and pain on a single-leg heel raise. An international consensus of foot and ankle surgeons agreed on midfoot tenderness, pain with a squeeze test and not being able to take weight as the key findings.
Because it looks like a sprain, about 1 in 5 is missed at first, in one review. In a study of 60 people, plain X-rays picked up 31 of 45 injuries that CT (computed tomography) scans confirmed. An NHS emergency department guideline asks staff to consider a Lisfranc injury in anyone who still can't take weight on a painful midfoot after simple painkillers, even with a normal X-ray, and to keep weight off it and refer them to fracture clinic.
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Scans: what they show
Standing (weight-bearing) X-rays of both feet look for widening between the first and second metatarsals; an MRI (magnetic resonance imaging) scan helps when the diagnosis is in doubt, and CT shows the extent of the injury and plans surgery. The consensus recommends standing X-rays of both feet first, then CT or MRI for subtle injuries.
In the first days, many people can't stand on the foot for the X-ray: in 33 subtle injuries, people in the early phase didn't put weight on the injured foot, and CT showed small flakes of bone pulled off at the ligament attachments in 94%. A meta-analysis found both standard and weight-bearing CT pick up the injury, with weight-bearing CT more accurate on some measurements.
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Stable or unstable
The key question is whether the joints are stable. Stable injuries that haven't moved, confirmed on a scan and sometimes with a stress test under X-ray, can be treated without surgery; displaced or unstable injuries need surgery. In Oslo, breaks into the two outer joints, and being a woman, made instability more likely. Some injuries that have barely moved shift within weeks, so repeat X-rays matter.
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Recovery and the long-term outlook
After either treatment, getting back to all activities takes 6 months to a year; some people keep midfoot pain, and some athletes don't return to their previous level.
Arthritis can follow: in one meta-analysis of 14 studies (686 people), about 1 in 3 developed arthritis in the inner midfoot by about 5 years, more often when the joints weren't put back perfectly in line. In studies of non-surgical care, rates ranged from 5% to 38%. Arthritis on an X-ray doesn't always mean a poor result: in a Norwegian trial, 11 of 24 people in one group had signs of arthritis in the first joint at 2 years, yet both groups had good scores.
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