**Appendix**

Most muscle injuries will respond to rehabilitation treatment without complications. Grade I strains have a low risk of tear extension and heal within 2 weeks with conservative manage‐ ment. Grade II strains require at least 4 weeks of conservative management, with a significant risk of tear extension if the patient returns to full exercise too early. It has been shown that if more than 50% of the cross-sectional area of the hamstring is torn, this correlates well with a convalescence period of greater than six weeks. Increasing length of a strain has also been

Prevention strategies, although promising, have not yet proven their effectiveness. Currently, there are very few scientific evidences that a determined preventative protocol has been effective, leading to a statistically significant decrease in muscular injuries. Therefore further

Due to the lack of experimental studies on treatment of muscle injuries, basic sciences are

**From scientific evidence to clinical practice**
