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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