The posterior talofibular ligament (PTFL) is one of the three ligaments which make up the lateral collateral ligament complex of the ankle. The components of this ligamentous complex are:

• anterior talofibular ligament
• posterior talofibular ligament
• calcaneofibular ligament.

The posterior talofibular ligament takes a horizontal course across the malleolar fossa, attaching on one side to the medial aspect of the lateral malleolus, and on the other side, to the lateral tubercle on the posterior surface of the talus.

The posterior talofibular ligament is the least commonly injured ligament of the three lateral ligament complex ligaments of the ankle.