<prompt> In ankle sprain, the commonest ligament torn is?Tibio-talar ligamentDeltoid ligamentPosterior talo-fibular ligamentAnterior talo-fibular ligament  <response>: Ankle sprain is an inversion injury and anterior talo-fibular ligament is first to be damaged. More severe injury can also damage origin of extensor digitorum brevis and calcaneo-fibular ligament. 