[The lateral articular surface of the medial cuneiform bone facing the intermediate cuneiform bone].

300 medial cuneiform bones were examined to explore the different forms of the joint surface on the lateral side of the bone facing the intermediate cuneiform bone. This joint surface consists of two parts, a proximal one and a dorsal one. The proximal part is orientated dorsoplantarally. At its proximal margin there exists a tight contact with the proximal joint surface for the navicular bone. The dorsal part is sited at the dorsal margin of the lateral side of the bone. Different forms of fusion of these part could be seen. In 62.67% they show tight confluence. In 17.67% the fusion is limited to a slight contact. In the rest, 19.67%, there exists no contact between these two parts. These forms correlate to the proximal height of the bone. A large proximal height extends the degree of separation of the dorsal joint surfaces (consisting of the dorsal section of the proximal part and the whole dorsal of the joint surface for the intermediate cuneiform bone as well as the joint surface for the second metatarsal bone). Therefore these joint surfaces are split to their components.