• Title: Eccentric knee flexor strength and risk of hamstring injuries in Rugby Union: A prospective study

  • Author/s: Bourne (@MBourne5), Opar (@davidopar), Williams (@drmorgs),  Shield (@das_shield)

  • Year: 2015

  • Question: How does eccentric knee flexor strength relate to risk of hamstring injuries in Rugby Union?

  • Key Takeaway: Eccentric knee flexor strength does not increase the likelihood of future hamstring strain injury in rugby union players

  • Summary: Investigating the relationship between eccentric knee-flexor strength via the Nordic hamstring exercise and the risk of HSI in rugby union. 

    Key Findings:

    • To determine if lower levels of eccentric knee-flexor strength or greater between-limb imbalance in this parameter during the Nordic hamstring exercise are risk-factors for hamstring strain injury in rugby union.
    • Players with a history of hamstring strain injury had 4.1 fold greater risk of subsequent hamstring injury than players without such history.
    • Between-limb imbalance in eccentric knee-flexor strength of ≥ 15% and ≥ 20% increased the risk of hamstring strain injury 2.4 fold and 3.4 fold respectively.
    • Lower eccentric knee flexor strength and other prior injuries were 49 not associated with increased risk of future hamstring strain.