Sheth U, et al. – This study compared the time to return to sport and reinjury rate between patients treated with platelet–rich plasma (PRP) injection versus control therapy (i.e., physiotherapy or placebo injection) for acute grade I or II muscle strains. A limited evidence from current literature was found to be indicative of the possibility of PRP providing an earlier return to the sport, without markedly increasing the risk of reinjury at 6 months of follow–up. However, specific assessment of patients with a grade I or II hamstring muscle strain revealed no difference in time to return to sport.