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Screening hamstring injury risk factors multiple times in a season does not improve the identification of future injury risk
Opar, David A. Ruddy, Joshua D. Williams, Morgan D. Maniar, Nirav Hickey, Jack T. Bourne, Matthew N. Pizzari, Tania Timmins, Ryan G.
Opar, David A.
Ruddy, Joshua D.
Williams, Morgan D.
Maniar, Nirav
Hickey, Jack T.
Bourne, Matthew N.
Pizzari, Tania
Timmins, Ryan G.
Abstract
Purpose
To determine if eccentric knee flexor strength and biceps femoris long head (BFlh) fascicle length were associated with prospective hamstring strain injury (HSI) in professional Australian Football players, and if more frequent assessments of these variables altered the association with injury risk.
Methods
Across two competitive seasons, 311 Australian Football players (455 player seasons) had their eccentric knee flexor strength during the Nordic hamstring exercise and BFlh architecture assessed at the start and end of preseason and in the middle of the competitive season. Player age and injury history were also collected in preseason. Prospective HSIs were recorded by team medical staff.
Results
Seventy-four player seasons (16%) sustained an index HSI. Shorter BFlh fascicles (<10.42 cm) increased HSI risk when assessed at multiple time points only (relative risk [RR], 1.9; 95% confidence interval [CI], 1.2–3.0). Neither absolute (N) nor relative (N·kg−1) eccentric knee flexor strength was associated with HSI risk, regardless of measurement frequency (RR range, 1.0–1.1); however, between-limb imbalance (>9%), when measured at multiple time points, was (RR, 1.8; 95% CI, 1.1–3.1). Prior HSI had the strongest univariable association with prospective HSI (RR, 2.9; 95% CI, 1.9–4.3). Multivariable logistic regression models identified a combination of prior HSI, BFlh architectural variables and between-limb imbalance in eccentric knee flexor strength as optimal input variables; however, their predictive performance did not improve with increased measurement frequency (area under the curve, 0.681–0.726).
Conclusions
More frequent measures of eccentric knee flexor strength and BFlh architecture across a season did not improve the ability to identify which players would sustain an HSI.
Keywords
Australian football, hamstring muscles, wounds and injuries, risk factors, prospective study
Date
2021
Type
Journal article
Journal
Medicine and Science in Sports and Exercise
Book
Volume
54
Issue
2
Page Range
321-329
Article Number
ACU Department
School of Behavioural and Health Sciences
Faculty of Health Sciences
Faculty of Health Sciences
Relation URI
Source URL
Event URL
Open Access Status
License
All rights reserved
File Access
Controlled