The anterior inferior ligament and the anterior ligament of the lateral malleolus are also known as the anterior tibiotalar ligament. It is located in the ankle. This ligament is made up of a triangular band of fibers that broadens as it descends.

This ligament extends laterally (away from the midline of the body) and downwards between the tibia (shinbone) and fibula (calf bone). The ligament passes in front of and across the fibular malleolus (the bony projection at the inside of each ankle) and to the talus bone, which is one of the bones that makes up the lower part of the ankle joint.

The anterior tibiotalar ligament is the most commonly sprained ligament. Approximately 85 percent of ankle sprains are lateral sprains, which result from plantar flexion inversion injuries. “Roll-over” sprains—when the foot rolls inward and over-stretches the lateral ligaments in the ankle—cause these injuries.