The CFL runs from the lateral malleolus to the lateral calcaneus, providing stability against inversion at both the ankle and subtalar joints, taut in dorsiflexion.
Crosses both ankle and subtalar joints to resist combined hindfoot inversion instability.
CFL injuries rarely occur in isolation and almost always accompany ATFL tears in moderate-severe sprains. Talar tilt test assesses combined integrity.
Inversion in neutral or dorsiflexion tearing the CFL, producing posteroinferior malleolar tenderness and positive talar tilt — virtually always combined with ATFL injury in Grade III sprains.
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