Lapidus bunionectomy: arthrodesis of the first metatarsocunieform joint.

Fusion of the first metatarsocunieform (MC) joint allows for correction of the first metatarsal in three planes, including adduction, plantarflexion, and rotation. It also allows for decreased jamming of the great toe joint and increased medial column stability. As knowledge about other medial column procedures grows, fusion of the first MC joint will continue to grow in popularity.