Lateral Ligaments

Question 1

Posterior Talofibular Ligament (PTFL)

Answer 1

Origin: Malleolar fossa on the medial surface of the lateral malleolus

Insertion: Lateral tubercle on the posterior surface of the talus

Question 2

PTFL Function and MoI

Answer 2

Function: Resists posterior movement of the talus, and inversion/torsion stresses in a dorsiflexed foot

MoI: The least commonly injured of the lateral ligaments; usually a severe ankle sprain as a result of trauma to the ankle joint

Question 3

Calcaneofibular Ligament (CFL)

Answer 3

Origin: Tip of the lateral Malleolus

Insertion: Lateral surface of the calcaneus

Question 4

CFL Function and MoI

Answer 4

Function: Stabilises the subtalar joint; preventing inversion of the ankle in neutral or dorsiflexion.

MoI: Ruptures of the CFL are rate, but combined ruptures of the CFL and ATFL occur in 20% of cases. Usually an inversion-internal-rotation ankle sprain - rear foot supinates excessively on a lower leg that is externally rotated.

Question 5

Anterior Talo-fibular Ligament (ATFL)

Answer 5

Origin: Anterior edge of the lateral malleolus of fibula

Insertion: The neck of the talus, in front of the lateral malleolar facet

Question 6

ATFL Function and MoI

Answer 6

Function: Resists inversion and plantarflexion of the ankle

MoI: Usually when the athlete’s foot rolls inward at a high velocity. Centre of gravity is shifted over the lateral border of the weight-bearing leg.