Intercuneiform instability and the "gap" sign

We describe three cases of low-energy injuries to the midfoot resulting in rupture of Lisfranc's ligament without tarsometatarsal injury. Examination of the feet revealed an obvious physical sign only on weightbearing, and al l three patients were noted at surgery to have intercuneiform instability i n association with a rupture of Lisfranc's ligament.