A navicular bone is one of the tarsal bones of the foot or one of the carpal bones of the wrist. Tarsus (skeleton): in human anatomy, the wrist is the flexible and narrower connection between the forearm and the hand.

The term navicular bone or hand navicular bone was formerly used for the scaphoid bone. The scaphoid bone of the wrist is found on the thumb side of the hand, within the anatomical snuffbox, one of the carpal bone.

As the bones in the foot develop, a particular process is important for the navicular structure. In the early stage, the navicular bone is basically rich in cartilage and has to progress and calcify in order to maintain a strong form. There is a condition, however, in which the three cuneiforms that compose the bone do not completely calcify as a unit.

In other words, they do not fuse properly, which leads to the most medial third creating a protrusion along the medial arch. This extension of the foot has a tendency to put stress on two tendons and the ligament that run along its side. The tendon of the peroneous brevis muscle which is the most distal of the two tendons, the tendon of the peroneous longus muscle which extends to the posterior of the ankle, and the posterior talofibular ligament which extends upward partway along the calf muscle, can all be potentially affected by this protrusion.

Sometimes referred to as an extra navicular bone, this bump can cause wear and tear on the tendons causing sharp pain with increased activity.This condition can be corrected with surgery to file down or remove the protrusion and repair the tendons that were affected.