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Table 3 Classification of posterior thigh muscle injury according to active range of motion deficit of knee extension. Malliaropoulos et al. Am J Sports Med. 2010 Sep; 38(9):1813–9

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

Clinical grade

Active ROM deficit

I

Up to 9 degrees

II

10 to 19 degrees

III

20 to 29 degrees

IV

More than 30 degrees

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Journal of Foot and Ankle Research

ISSN: 1757-1146