Friday, October 21, 2011
Bones and Ligaments of the Foot
The tibia and the fibula, the long bones of the lower leg, are connected to each other by the anterior and posterior tibiofibular ligaments. The talus is connected to the tibia by the anterior tibiotaler ligament (ATT), and is connected to the fibula by the anterior and posterior talofibular ligaments (ATF and PTF, respectively). The ATF is a lateral ligament whose function is to prevent the foot from sliding forward in relation to the shin. In a sprained ainkle, the ATF is most commonly injured because of an inversion injury. The tibia, fibula, and talus bones articulate to form the ankle joint. The subtalar joint connects the talus and the calcaneus, using the anterior and posterior talocalcaneal ligaments. The talus is connected to the navicular, a bone in the midfoot, by the tibionavicular ligament, which is part of the deltoid. The deltoid is a triangular family of ligaments that connect different bones, although they are close enough together that if one is injured they are all injured, which is why they are referred to by one collective name. The spring ligament connects the navicular and the calcanius. It is an important ligament because it provides the support for the arch of the foot. When it is torn, the foot bones collapse because of excessive pronation, causing a great deal of pain.