Background: The combined positioning of the trunk and knee in the coronal and sagittal planes during non-contact anterior cruciate ligament (ACL) injury has not been previously reported.
Hypothesis: During ACL injury female athletes demonstrate greater lateral trunk and knee abduction angles than ACL-injured male athletes and uninjured female athletes.
Study design: Cross-section control-cohort design.
Methods: Analyses of still captures from 23 coronal (10 female and 7 male ACL injured players and 6 female controls or 28 sagittal plane videos performing similar landing and cutting tasks. Significance was set at P≤ 0.05.
Results: Lateral trunk and knee abduction angles were higher in female compared to male athletes during ACL injury (P≤0.05) and trended toward being greater than female controls (p=0.16, 0.13, respectively). Female ACL-injured athletes showed less forward trunk lean than female controls (I.C.:1.6±9.3° vs. 14.0±7.3°, P≤0.01).
Conclusion: Female athletes landed with greater lateral trunk motion and knee abduction during ACL injury than did male athletes or control females during similar landing and cutting tasks.
Clinical relevance: Lateral trunk and knee abduction motion are important components of the ACL injury mechanism in female athletes as observed from video evidence of ACL injury.
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