Effect of a novel movement strategy in decreasing ACL risk factors in female adolescent soccer players: a randomized controlled trial

Richard G Celebrini, Janice Jennifer Eng, William C Miller, Christina Louise Ekegren, James D Johnston, Thomas A Depew, Donna L MacIntyre

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11 Citations (Scopus)


OBJECTIVE: To determine the effect of a novel movement strategy incorporated within a soccer warm-up on biomechanical risk factors for anterior cruciate ligament injury during 3 sport-specific movement tasks. DESIGN: Single-blind, randomized controlled clinical trial. SETTING: Laboratory setting. PARTICIPANTS: Twenty top-tier female teenage soccer players. INTERVENTIONS: Subjects were randomized to the Core Position and Control movement strategy (Core-PAC) warm-up or standard warm-up, which took place before their regular soccer practice over a 6-week period. The Core-PAC focuses on getting the centre of mass closer to the plant foot or base of support. MAIN OUTCOME MEASURES: Peak knee flexion angle and abduction moments during a side-hop (SH), side-cut, and unanticipated side-cut task after the 6 weeks with (intervention group only) and without a reminder to use the Core-PAC strategy. RESULTS: The Core-PAC group increased peak flexion angles during the SH task [mean difference = 6.2 degrees; 95 confidence interval (CI), 1.9-10.5 degrees; effect size = 1.01; P = 0.034] after the 6-week warm-up program without a reminder. In addition, the Core-PAC group demonstrated increased knee flexion angles for the side-cut (mean difference = 8.5 degrees; 95 CI, 4.8-12.2 degrees; ES = 2.02; P = 0.001) and SH (mean difference = 10.0 degrees; 95 CI, 5.7-14.3 degrees; ES = 1.66; P = 0.001) task after a reminder. No changes in abduction moments were found. CONCLUSIONS: The results of this study suggest that the Core-PAC may be one method of modifying high-risk soccer-specific movements and can be implemented within a practical, team-based soccer warm-up. The results should be interpreted with caution because of the small sample size.
Original languageEnglish
Pages (from-to)134 - 141
Number of pages8
JournalClinical Journal of Sport Medicine
Issue number2
Publication statusPublished - 2014

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