The intermediate cuneiform is the smallest of the three cuneiforms, wedged between the medial and lateral cuneiforms and articulating with the second metatarsal — its tight, keystone-like position makes it the most stable of the Lisfranc joint bones.
The intermediate cuneiform is the smallest of the three cuneiforms and is recessed posterior to the medial and lateral cuneiforms, forming the socket that locks the second metatarsal base and creates the inherently stable central column of the Lisfranc joint. This recessed architecture explains why the second metatarsal requires the Lisfranc ligament to lock it medially — there is no interosseous ligament between the first and second metatarsals.
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