Imaging Case of the Week 89

The following x-ray images are from a 19 year old patient who was involved in a motor vehicle accident. What can you notice on the x-rays?

Right foot oblique view

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Right foot AP view

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Right foot lateral view

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[peekaboo_link name=”Answer”]Answer[/peekaboo_link] [peekaboo_content name=”Answer”]

The foot x-rays show a Lisfranc injury with fracture of the bases of the 2nd to 5th metatarsals as well as a lateral displacement of the 2nd, 3rd and 4th metatarsal bases relative to the tarsal bones.

The following 3D CT images are from the same patient showing an abnormally widened gap between the 1st and 2nd metatarsal bases.

3D CT Lisfranc

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3D CT Lisfranc 2

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Lisfranc fracture is fracture-dislocation of the tarso-metatarsals. Key to normal alignment is that the medial border of the second metatarsal should always line up with the medial border of the second cuneiform. If the dislocation is minor, it can be easily missed.

normal tarsometatarsal alignment

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The patient underwent operative reduction and internal fixation.

Reference: Fundamentals of Diagnostic Radiology by Brant and Helms