Chronic lateral ankle instability occurs in 10% to 20% of people after an acute ankle sprain. Initial treatment is conservative but if this fails and ligament laxity is present, surgical intervention is considered.
de Vries, J. S., Krips, R., Sierevelt, I. N., Blankevoort, L., & van Dijk, C. N. (2011). Interventions for treating chronic ankle instability. Cochrane Database of Systematic Reviews. https://doi.org/10.1002/14651858.cd004124.pub3