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Table 1 Revised criteria for the classification of acute injury of the lateral ligament complex of the ankle compared to the uninjured side. Malliaropoulos et al. Foot Ankle Clinics 2006 Sep; 11(3):497–507

From: Higher frequency of hamstring injuries in elite track and field athletes who had a previous injury to the ankle - a 17 years observational cohort study

Grade Decreased ROM Edema difference Stress radiographs
I Up to 5 degrees Up to 0.5 cm Normal
II 5 to 10 degrees 0.5 cm to 2 cm Normal
IIIA (III) More than 10 degrees More than 2 cm Normal
IIIB (IV) More than 10 degrees more than 2 cm Laxity greater than 3 mm