Dynamic knee valgus alignment influences impact attenuation in the lower extremity during the deceleration phase of a single-leg landing
Open Access
- 20 June 2017
- journal article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 12 (6), e0179810
- https://doi.org/10.1371/journal.pone.0179810
Abstract
Dynamic knee valgus during landings is associated with an increased risk of non-contact anterior cruciate ligament (ACL) injury. In addition, the impact on the body during landings must be attenuated in the lower extremity joints. The purpose of this study was to investigate landing biomechanics during landing with dynamic knee valgus by measuring the vertical ground reaction force (vGRF) and angular impulses in the lower extremity during a single-leg landing. The study included 34 female college students, who performed the single-leg drop vertical jump. Lower extremity kinetic and kinematic data were obtained from a 3D motion analysis system. Participants were divided into valgus (N = 19) and varus (N = 15) groups according to the knee angular displacement during landings. The vGRF and angular impulses of the hip, knee, and ankle were calculated by integrating the vGRF-time curve and each joint’s moment-time curve. vGRF impulses did not differ between two groups. Hip angular impulse in the valgus group was significantly smaller than that in the varus group (0.019 ± 0.033 vs. 0.067 ± 0.029 Nms/kgm, p<0.01), whereas knee angular impulse was significantly greater (0.093 ± 0.032 vs. 0.045 ± 0.040 Nms/kgm, p<0.01). There was no difference in ankle angular impulse between the groups. Our results indicate that dynamic knee valgus increases the impact the knee joint needs to attenuate during landing; conversely, the knee varus participants were able to absorb more of the landing impact with the hip joint.This publication has 21 references indexed in Scilit:
- Prevention of non-contact anterior cruciate ligament injuries in soccer players. Part 1: Mechanisms of injury and underlying risk factorsKnee Surgery, Sports Traumatology, Arthroscopy, 2009
- A stochastic biomechanical model for risk and risk factors of non-contact anterior cruciate ligament injuriesJournal of Biomechanics, 2009
- Effects of added trunk load and corresponding trunk position adaptations on lower extremity biomechanics during drop-landingsJournal of Biomechanics, 2008
- Failed jump landing trials: deficits in neuromuscular controlScandinavian Journal of Medicine & Science in Sports, 2007
- Mechanisms of Anterior Cruciate Ligament Injury in BasketballThe American Journal of Sports Medicine, 2007
- Effect of Fatigue on Knee Kinetics and Kinematics in Stop-Jump TasksThe American Journal of Sports Medicine, 2005
- Biomechanical Measures of Neuromuscular Control and Valgus Loading of the Knee Predict Anterior Cruciate Ligament Injury Risk in Female Athletes: A Prospective StudyThe American Journal of Sports Medicine, 2005
- Electromyographic analysis of the knee during jump landing in male and female athletesThe Knee, 2004
- Injury Mechanisms for Anterior Cruciate Ligament Injuries in Team HandballThe American Journal of Sports Medicine, 2004
- Kinetics of the lower extremities during drop landings from three heightsJournal of Biomechanics, 1993