Ligamentous injuries of the ankle are one the most common problems seen by general practioners and emergency physicians. The ligaments of the ankle can be divided into four anatomic groupings: The lateral ligaments, the lateral subtalar ligaments, the medial ligaments, and the distal tibiofibular interosseous ligaments. The lateral ligamentous complex consists of the anterior talofibular ligament (ATFL), the calcaneofibular ligament (CFL), and the posterior talofibular ligament (PTFL).The ATFL is the most frequently injured ligament in the human bodyThe CFL is a cylindrical structure that lies deep to the peroneal tendons. Structurally, it is 2.5 times stronger than the ATFL.The PTFL is the strongest of the lateral ligaments and is the least often injured.The lateral subtalar ligaments are quite complex and include five separate structures: the CFL, the inferior extensor retinaculum, the lateral talocalcaneal ligament, the cervical ligament, and the interosseous talocalcaneal ligament .