My best friend is a physical therapist. I went to him years ago for a sprained ankle and somehow someway, he could tell that I had problems with that ankle before. He basically said that ankle sprains never fully heal and the likelihood of spraining it again goes up something ridiculous.
We work in the same part of town. I'll ask him tomorrow what he thinks of the injury.
It's something about your ankle getting looser, it does recover to an extent but you'll be more likely to roll it and it turning into a more serious injury in the months following. But that's most injuries, your body does the best it can but all injuries don't recover properly and one might lead to another like a car.