Plantar calcaneonavicular

Plantar calcaneonavicular ligament
Ligaments of the medial aspect of the foot. (Plantar calcaneonavicular ligament labeled at bottom center.)
Ligaments of the sole of the foot, with the tendons of the Peronæus longus, Tibialis posterior and Tibialis anterior muscles. (Plantar calcaneonavicular ligament labeled at right, second from the bottom.)
Details
From	calcaneus
To	navicular
Identifiers
Latin	ligamentum calcaneonaviculare plantare
TA	A03.6.10.203
FMA	44254
Anatomical terminology []

The plantar calcaneonavicular ligament (also known as the spring ligament or spring ligament complex) is a complex of three ligaments on the underside of the foot that connect the calcaneus with the navicular bone.

The plantar calcaneonavicular ligamentous complex is a broad and thick band with three constituent ligaments that connect the anterior margin of the sustentaculum tali of the calcaneus to the plantar surface of the navicular. Its individual components are the superomedial, intermedial (medioplantar) and lateral (inferoplantar) ligaments, which fan out and attach to the navicular bone at three separate locations.

This ligamentous complex not only serves to connect the calcaneus and navicular, but supports the head of the talus, forming part of the articular cavity in which it is received. It helps to maintain the medial longitudinal arch of the foot, and by providing support to the head of the talus, bears most of the body weight in a normally functioning foot. When torn, it can result in a flatfoot deformity, and impair mobility.

The dorsal or superomedial component of the ligament presents a fibrocartilaginous facet, lined by the synovial membrane, upon which a portion of the head of the talus rests. Its plantar surface, consisting of the intermedial and lateral ligaments, is supported by the tendon of the tibialis posterior; its medial border is blended with the forepart of the deltoid ligament of the ankle-joint.

This article incorporates text in the public domain from page 355 of the 20th edition of Gray's Anatomy (1918)