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

Table 3 Criteria for return-to-play (RTP)

Sign	General Recommendation
Pain	Pain-free (on direct palpation)
	Pain free on hamstring contraction (resisted isometric hamstring muscle contraction)
Range of motion	Symmetrical with unaffected site
Strength	Isokinetic strength within 5%[29, 30] to 10%[8] of contralateral side

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