Ligaments are soft tissues made of collagen and attach bone to bone. On the outside (lateral) side of the ankle there are three major ligaments, there are several more ligaments on the inside (medial) side of the ankle joint. Ligaments in the foot include the plantar calcaneonavicular ligament, the deltoid ligament, the long plantar ligament, and the plantar calcaneocuboid.
The plantar fascia is a thick connective tissue in the foot that runs from the calcaneus or heel bone to the metatarsal heads at the base of the toes. The plantar fascia is found in the sole of the foot, and helps to support the arch of the foot. The plantar fascia can become inflamed, causing a condition known as plantar fasciitis – a common cause of foot pain.