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Anatomy · Lower limb: Lisfranc injury
Sample itemAfter a twisting injury to the foot, a patient has midfoot swelling, plantar bruising and widening between the base of the second metatarsal and the medial cuneiform on weight-bearing X-ray. Which ligament is most likely torn?
Original practice item, not a recalled exam question. Nothing here is recorded.
The answer and the reasoning
B. Lisfranc ligament
The Lisfranc ligament runs from the medial cuneiform to the base of the second metatarsal and stabilises the tarsometatarsal joints. Its disruption allows widening of the first and second metatarsal bases.
Option by option
A. Plantar calcaneonavicular ligament
This spring ligament supports the head of the talus and is not between cuneiform and metatarsal.
B. Lisfranc ligament (correct)
Correct. This ligament links the medial cuneiform with the second metatarsal base.
C. Bifurcate ligament
This Y-shaped ligament connects the calcaneus to the cuboid and navicular on the dorsum of the foot.
D. Long plantar ligament
This ligament spans from the calcaneus to the cuboid and metatarsal bases and resists arch flattening, not this widening.
Source note: Original NextPrep sample item — pending expert review. This item is original practice material awaiting independent expert review, so confirm important facts in a standard textbook.
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