Eversion of the ankle places the deltoid ligament under tension, making it the ligament most likely to be injured. The deltoid ligament strongly resists excessive eversion.

Why not the others?

Anterior talofibular ligament (ATFL): Most commonly injured in inversion injuries.
Posterior talofibular ligament (PTFL): Can be injured with severe inversion injuries.
Calcaneofibular ligament (CFL): Injured with inversion, particularly when the ankle is dorsiflexed.
Spring ligament: Supports the medial longitudinal arch.

High-yield point:
Inversion → lateral ligaments (ATFL ± CFL/PTFL).
Eversion → deltoid ligament.

In an eversion injury, which ligament is likely to be damaged?