Detailed Record


Indirect contact matters: Mid-flight external trunk perturbation increased unilateral anterior cruciate ligament loading variables during jump-landings


Abstract To determine the effect of unanticipated mid-flight medial-lateral external perturbation of the upper or lower trunk on anterior cruciate ligament (ACL) loading variables during jump-landings.Thirty-two participants performed double-leg vertical jump-landings while bilateral kinematics and kinetics were collected under 6 conditions (upper or lower trunk perturbation locations; no, left, or right perturbation directions). Two customized catapult apparatuses were created to apply pushing perturbation to participants near the maximal jump height.The ball contacted participants near the center of mass for the lower-trunk conditions and approximately 23 cm above the center of mass for the upper-trunk conditions. Under upper-trunk perturbation, the contralateral leg demonstrated significantly smaller knee flexion angles at initial contact and greater peak knee abduction angles, peak vertical ground reaction forces, peak knee extension moments, and peak knee adduction moments compared to other legs among all conditions. Under lower-trunk perturbation, the contralateral leg showed significantly smaller knee flexion angles at initial contact and increased peak vertical ground reaction forces and peak knee extension moments compared to legs in the no-perturbation conditions.Mid-flight external trunk pushing perturbation increased ACL loading variables for the leg contralateral to the perturbation. The upper-trunk perturbation resulted in greater changes in ACL loading variables compared to the lower-trunk perturbation, likely due to trunk and ipsilateral leg rotation and more laterally located center of mass relative to the contralateral leg. These findings may help us understand the mechanisms of indirect-contact ACL injuries and develop jump-landing training strategies under mid-flight trunk perturbation to better prevent ACL injury.
Authors Yu Song University of WyomingORCID , Ling Li University of WyomingORCID , Jacob S. Layer University of Wyoming , Raychl Fairbanks University of Wyoming , Maddy Jenkins University of Wyoming , Gerwyn Hughes ORCID , Derek T. Smith University of Wyoming , Margaret Wilson University of WyomingORCID , Qin Zhu University of WyomingORCID , Boyi Dai University of WyomingORCID
Journal Info Elsevier BV | Journal of Sport and Health Science , vol: 12 , iss: 4 , pages: 534 - 543
Publication Date 7/1/2023
ISSN 2213-2961
TypeKeyword Image article
Open Access gold Gold Access
DOI https://doi.org/10.1016/j.jshs.2022.12.005
KeywordsKeyword Image Anterior Cruciate Ligament (Score: 0.530962)