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Table 2 Clinical grading systems for muscle injuries

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

Name of classification Year Focus (if any) Number of grades used
O’Donoghue 1962 3
Ryan 1969 Quadriceps (initially) 4
Takebayashi 1995 Ultrasound 3
Peetrons 2002 Ultrasound 3
Stoller 2007 MRI 3
Munich 2012 MRI 4 + contusions