OITE/Board Review: F&A 12: Midfoot Trauma - Lisfranc Injuries
Nailed It Ortho
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What Is the Flex Sign?
The flex sign is based on the devotion of the Liz Frank ligament from the base of this second metatarsal. If it's not seen on x-ray, it'll be seen on a CT scan. When you're looking at an oblique film, you want the medial aspect of the cuboid bone to line up with the fourth meetatarsal.
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