“…28 It should also be acknowledged that while some studies have found an association between low levels of knee-flexor strength and subsequent HSI, 21,28,42 prior injury is also associated with knee-flexor weakness, 12,22,26,27,35 and this may confound results. 30 The current study supports prior HSI as a risk factor for re-injury which is consistent with earlier observations in rugby union 9,36 Australian football 4,16,30,39 and soccer. 2 While the mechanism(s) explaining why prior HSI augments the risk of re-injury remain(s) unclear, this study revealed a significant relationship between prior HSI and between-limb imbalance in eccentric knee-flexor strength.…”