Table I.

Classification of acute ankle sprain according to its grade, severity, pathophysiology and clinical findings

Grade	Severity	Pathophysiology	Clinical findings
Grade 1	Mild	Stretch of the ATFL, causing tear of the ligament fibres.	Mild swelling, no laxity, little ecchymosis, and difficulty in full weight bearing.
Grade 2	Moderate	Moderate injury to the lateral ligamentous complex with a complete tear of the ATFL ± Partial tear of the CFL.	Localised swelling, hemorrhage ecchymosis, and anterolateral tenderness. Abnormal laxity may be mild or absent.
Grade 3	Severe	Complete disruption of the ATFL along with CFL and PTFL.	Tenderness, swelling and ecchymosis on the lateral ankle and heel side with marked laxity.