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Foot and Ankle Anatomy

The foot; It's bones and movements

 

The ankle joint (talocrural joint) is composed of 3 bones. The central ankle bone is the talus, this is surrounded on either side by the tibia and the fibula.
On the inside of the ankle, the joint is maintained by a very strong ligament, the deltoid ligament, which helps resist rolling in of the ankle. On the outside of the ankle are the much weaker lateral ankle ligaments. One of these ligaments, the anterior talofibular ligament (ATFL) is the most commonly injured ligament in the body





The ankle joint allows the foot to move up (dorsiflexion) and down (plantarflexion).  Around the ankle joint are several tendons which enter the foot from the muscles of the leg.
The foot is an incredibly complex structure consisting of 28 bones, 33 joints , 19 muscles and 107 ligaments.


The foot can be divided into 3 segments:The rearfoot, the midfoot and the forefoot.

The rearfoot consists of the largest bone in the foot, the calcaneus, as well as the talus. The joint formed between the two is the subtalar joint which plays a significant role in foot function.

The midfoot consists of five tarsal bones: navicular, cuboid, medial, intermediate and lateral cuneiforms. These bones form the arch of the foot and act to absorb shock (attenuate load).

The forefoot consists of the five metatarsals, the fourteen toe bones (the phalanges) and two sesamoid bones located under the big toe joint.

 

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