Which ligament supports the medial longitudinal arch of the foot by providing a resting surface for the talus?

The plantar calcaneonavicular ligament, commonly known as the spring ligament, plays a crucial role in supporting the medial longitudinal arch of the foot. It connects the calcaneus (the heel bone) to the navicular bone and serves as a flexible, elastic structure that provides a resting surface for the talus bone, which is situated above it. This positioning helps maintain the integrity of the medial longitudinal arch during weight-bearing activities.

As the foot bears weight, the spring ligament absorbs stresses and contributes to the arch's resilience, preventing excessive flattening or collapse. Its importance in arch support is a key factor in effective foot biomechanics, influencing both stability and mobility. When this ligament is intact and functioning properly, it helps to preserve the natural shape of the foot, ensuring efficient weight distribution and shock absorption.

Other ligaments mentioned in the options do not serve the same specific function related to the medial longitudinal arch. While the long plantar ligament provides some support to the longitudinal arch, it does not create a resting surface for the talus and is primarily associated with the support of the lateral aspect of the arch. The deltoid ligament, located on the medial side of the ankle, is primarily involved in ankle stability rather than arch support. Lastly, the lateral