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Table 1 Grading of muscle strain injuries on ultrasound

From: Platelet-rich plasma (PRP): an adjuvant to hasten hamstring muscle recovery. A randomized controlled trial protocol (ISCRTN66528592)

Grade

Ultrasound findings

0

No ultrasound features seen

1

Muscle oedema only

2a

Partial tears of muscle fibres, disruption involving <33%

2b

Partial tears of muscle fibres, disruption involving ≥ 33 – 66%

2c

Partial tears of muscle fibres, disruption involving ≥ 66 - 99%

3

Complete tear of muscle