Similar Isokinetic Strength Preinjury and at Return to Sport after Hamstring Injury

Introduction Side-to-side strength differences are often used in return to sport (RTS) decision making following hamstring injury. In football (soccer), there is little consensus, and a side-to-side difference of 95% compared to pre-injury strength. Overall, 63.4% of the players had a >10% negative strength difference (i.e. the injured limb being weaker) and 57.9% of the players had a >10% positive strength difference (i.e. the injured limb being stronger) in at least one of the five isokinetic variables. Conclusion The distribution of isokinetic strength differences when comparing strength at RTS to pre-injury measures were similar, urging clinical caution when interpreting these results. Small changes in isokinetic strength of the injured limb at RTS compared to pre-injury strength suggest that isokinetic cut-off values are not useful to guide restoration of strength as a criterion for RTS after hamstring injury. Corresponding author: Nicol van Dyk, Aspetar Orthopaedic and Sports Medicine Hospital, PO Box 29222, Doha, Qatar. nicol.vandyk@aspetar.com. Telephone: ++974 4413 2000. Fax: +974 44132020 Competing interests - None Funding - Nothing to declare This present study do not constitute endorsement by ACSM. Accepted for publication: 26 December 2018. © 2019 American College of Sports Medicine

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