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

Bourne, Matthew, Opar, David A., Williams, Morgan, & Shield, Anthony (2015) Eccentric knee-flexor strength and risk of hamstring injuries in Rugby Union: A prospective study. American Journal of Sports Medicine, 43(11), pp. 2663-2670.

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Abstract

BACKGROUND

Hamstring strain injuries (HSIs) represent the most common cause of lost playing time in rugby union. Eccentric knee-flexor weakness and between-limb imbalance in eccentric knee-flexor strength are associated with a heightened risk of hamstring injury in other sports; however these variables have not been explored in rugby union.

PURPOSE

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.

STUDY DESIGN

Cohort study; level of evidence, 3.

METHODS

This prospective study was conducted over the 2014 Super Rugby and Queensland Rugby Union seasons. In total, 178 rugby union players (age, 22.6 ± 3.8 years; height, 185 ± 6.8 cm; mass, 96.5 ± 13.1 kg) had their eccentric knee-flexor strength assessed using a custom-made device during the pre-season. Reports of previous hamstring, quadriceps, groin, calf and anterior cruciate ligament injury were also obtained. The main outcome measure was prospective occurrence of hamstring strain injury.

RESULTS

Twenty players suffered at least one hamstring strain during the study period. Players with a history of hamstring strain injury had 4.1 fold (RR = 4.1, 95% CI = 1.9 to 8.9, p = 0.001) 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 (RR = 2.4, 95% CI = 1.1 to 5.5, p = 0.033) and 3.4 fold (RR = 3.4, 95% CI = 1.5 to 7.6, p = 0.003), respectively. Lower eccentric knee flexor strength and other prior injuries were not associated with increased risk of future hamstring strain. Multivariate logistic regression revealed that the risk of re-injury was augmented in players with strength imbalances.

CONCLUSION

Previous hamstring strain injury and between-limb imbalance in eccentric knee-flexor strength were associated with an increased risk of future hamstring strain injury in rugby union. These results support the rationale for reducing imbalance, particularly in players who have suffered a prior hamstring injury, to mitigate the risk of future injury.

Impact and interest:

7 citations in Scopus
6 citations in Web of Science®
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ID Code: 87555
Item Type: Journal Article
Refereed: Yes
Keywords: injury prevention, muscle injuries, Nordic hamstring exercise, Physical therapy/rehabilitation, rugby
DOI: 10.1177/0363546515599633
ISSN: 1552-3365
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2015 American Orthopaedic Society for Sports Medicine
Deposited On: 20 Sep 2015 23:42
Last Modified: 22 Jun 2017 11:49

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