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      Use of autologous platelet-rich plasma to treat muscle strain injuries.

      The American journal of sports medicine

      Animals, Blood Transfusion, Autologous, Blotting, Western, Injections, Intramuscular, Male, Muscle, Skeletal, injuries, Platelet-Rich Plasma, Rats, Rats, Sprague-Dawley, Recovery of Function, physiology, Reverse Transcriptase Polymerase Chain Reaction, Sprains and Strains, physiopathology, rehabilitation, therapy, Treatment Outcome

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          Abstract

          Standard nonoperative therapy for acute muscle strains usually involves short-term rest, ice, and nonsteroidal anti-inflammatory medications, but there is no clear consensus on how to accelerate recovery. Local delivery of platelet-rich plasma to injured muscles hastens recovery of function. Controlled laboratory study. In vivo, the tibialis anterior muscles of anesthetized Sprague-Dawley rats were injured by a single (large strain) lengthening contraction or multiple (small strain) lengthening contractions, both of which resulted in a significant injury. The tibialis anterior either was injected with platelet-rich plasma, was injected with platelet-poor plasma as a sham treatment, or received no treatment. Both injury protocols yielded a similar loss of force. The platelet-rich plasma only had a beneficial effect at 1 time point after the single contraction injury protocol. However, platelet-rich plasma had a beneficial effect at 2 time points after the multiple contraction injury protocol and resulted in a faster recovery time to full contractile function. The sham injections had no effect compared with no treatment. Local delivery of platelet-rich plasma can shorten recovery time after a muscle strain injury in a small-animal model. Recovery of muscle from the high-repetition protocol has already been shown to require myogenesis, whereas recovery from a single strain does not. This difference in mechanism of recovery may explain why platelet-rich plasma was more effective in the high-repetition protocol, because platelet-rich plasma is rich in growth factors that can stimulate myogenesis. Because autologous blood products are safe, platelet-rich plasma may be a useful product in clinical treatment of muscle injuries.

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          Author and article information

          Journal
          19282509
          3523111
          10.1177/0363546508330974

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