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