Plantar calcaneonavicular ligament (Spring ligament)
The plantar calcaneonavicular ligament (spring ligament) is a thick, broad fibrous band that is located on the bottom of the foot. It connects the navicular bone's plantar surface with the calcaneus's sustentaculum. It also provides support to the head of the talus, forming a portion of the articular cavity that receives it and bearing a great portion of body weight. This ligament plays an important role in the development of acquired flat foot deformity in adults. It has been linked to the stabilization of the foot's longitudinal arch; this leads to insufficiency of the spring ligament, which causes it to tear. The plantar calcaneonavicular ligament complex is different in different feet. Sometimes it is comprised of two ligaments, the inferior calcaneonavicular and the superomedial; however, it most often has a third ligament. Plantar calcaneonavicular ligament (spring ligament) complexes with three ligaments tend to have their own fibrocartilage surface, which is connected with the fibrocartilate articular surface by a small fibrous band.
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In Depth: Plantar calcaneonavicular ligament (Spring ligament)