Extremity CLET Practice Exam

Lisfranc injuries involve disruption of which joint complex?

First metatarsophalangeal joint Tarsometatarsal joints (midfoot) Ankle mortise Subtalar joints

Correct Answer:

Tarsometatarsal joints (midfoot)

Explanation:

Lisfranc injuries disrupt the tarsometatarsal joint complex in the midfoot—the joints where the bases of the metatarsals articulate with the tarsal bones (medial, intermediate cunei and cuboid). This midfoot joint complex is stabilized by strong ligaments, including the Lisfranc ligament between the second metatarsal base and the medial cuneiform, and various interosseous and dorsal ligaments. When these joints are injured, the forefoot can separate from the midfoot, causing instability and pain. This is distinct from the first metatarsophalangeal joint (the big toe joint), the ankle mortise (tibia-talus), or the subtalar joints (talus-calcanus), which are not the Lisfranc joint complex.

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