The navicular is the keystone of the medial longitudinal arch, articulating with the talus behind and the three cuneiform bones in front. Its tuberosity is a palpable medial landmark and the insertion of the tibialis posterior tendon — a common site of stress fracture in runners.
The navicular is the keystone of the medial longitudinal arch, receiving and distributing forces from the talus to the three cuneiforms. The navicular tuberosity is the insertion of the tibialis posterior tendon and is the site of os naviculare (accessory navicular) in 12 percent of people — a normal variant that can become symptomatic in flat-footed individuals from tibialis posterior tension. Navicular stress fractures in athletes from repetitive midfoot loading are an important cause of dorsal midfoot pain that is easily missed on plain radiographs.
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