Final answer:
The 'spring ligament' or plantar calcaneonavicular supports the talus bone, resists excessive foot eversion, assists plantar flexion, and provides stability to the ankle alongside ligaments such as the calcaneofibular ligament.
Step-by-step explanation:
The plantar calcaneonavicular, commonly referred to as the 'spring ligament', plays a crucial role in maintaining the integrity of the arches of the foot.
It supports the talus bone and contributes to shock absorption and energy conservation during walking. The ligament helps to resist excessive foot eversion and also assists in the action of plantar flexion, a type of foot movement at the ankle in which the heel lifts off the ground.
Additionally, it works in conjunction with other foot ligaments, such as the calcaneofibular ligament, to provide stability to the ankle joint by resisting excess inversion of the foot.