The capsule of the talocalcaneonavicular joint, which is a synovial joint, is reinforced: posteriorly by the interosseous talocalcaneal ligament, superiorly by the talonavicular ligament, which passes between the neck of the talus and adjacent regions of the navicular, and inferiorly by the plantar calcaneonavicular ligament (spring ligament) (Fig. 6.107C,D).