Ankle sprains range in severity from grade I to grade III. A simpler approach is to divide these injuries into two groups: complicated and uncomplicated. Uncomplicated ankle sprains are treated without surgery. They include injuries not associated with concomitant problems that contraindicate early motion and rehabilitation. Complicated ankle sprains usually require surgical management. Of note, late instability is as common after surgical treatment as after nonoperative treatment of severe ankle ligament injury. Furthermore, late reconstruction is effective in patients initially treated nonoperatively.
In case you were interested, in the classification of ankle sprains, my ankle sprain is a grade - II ligament tear / ankle sprain.