It lies between the intermediate cuneiform and cuboid. It articulates proximally with the navicular and distally with the base of third metatarsal bone.
Structure of Lateral Cuneiform:
It consists of the following surfaces.
- Dorsal surface: It is rough and almost rectangular. It forms the base of wedge.
- Plantar surface: It is narrow and receives a slip for tendon of tibialis posterior.
- Distal surface: It is the triangular articular facet for the base of third metatarsal bone.
- Proximal surface: It is rough on its plantar aspect, while its dorsal aspect is articular, joining with the navicular through a triangular facet.
- Medial surface: It is partly non articular. The proximal margin of it is indented for the intermediate cuneiform.
- Lateral surface: It is also partly non-articular and bears a triangular facet for the cuboid bone. There is also an additional semi-lunar facet for articulation with medial side of the base of fourth metatarsal bone.
Blood supply of lateral cuneiform:
The lateral cuneiform is supplied via its dorsal, medial and lateral surfaces, mainly from the dorsal arterial network.
Nerve supply to lateral cuneiform:
The lateral cuneiform is innervated by branches of the deep peroneal and lateral plantar nerves.
Ossification of lateral cuneiform:
The center of ossification for the lateral cuneiform appears during the first year of life.