A nice FREE FULL TEXT literature review about the biomechanics, diagnosis, grading and treatment (conservative and non conservative) of acute ankle sprains. There is an interesting section at the end for prevention. Consider this a staple for your library to refer to when needed.
"This paper summarizes the current understanding on acute ankle sprain injury, which is the most common acute sport trauma, accounting for about 14% of all sport-related injuries. Among, 80% are ligamentous sprains caused by explosive inversion or supination. The injury motion often happens at the subtalar joint and tears the anterior talofibular ligament (ATFL) which possesses the lowest ultimate load among the lateral ligaments at the ankle. "
Fong DT, Chan Y-Y, Mok K-M, Yung PS, Chan K-M. Understanding acute ankle ligamentous sprain injury in sports. Sports Medicine, Arthroscopy, Rehabilitation, Therapy, and Technology : SMARTT. 2009;1:14. doi:10.1186/1758-2555-1-14.
link to full text: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2724472/