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Table 3 MRI-based classification system of muscle injuries and resulting lay-off time [3, 4]

From: Imaging of hip and thigh muscle injury: a pictorial review

Grade MRI finding Lay-off time (days)
0 Normal MRI 8 ± 3
1 Edema (Fig. 2) 17 ± 10
2 Partial tear (Figs. 3 and 4) 22 ± 11
3 Complete tear (Fig. 5) 73 ± 60