Can Technique Modification Training Reduce Knee Moments in a Landing Task?

in Journal of Applied Biomechanics
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Anterior cruciate ligament (ACL) injuries are costly. Sidestep technique training reduces knee moments that load the ACL. This study examined whether landing technique training alters knee moments. Nineteen team sport athletes completed the study. Motion analysis and ground reaction forces were recorded before and after 6 weeks of technique modification. An inverse dynamic model was used to calculate three-dimensional knee loading. Pre- and postintervention scores were compared using paired t tests. Maximal knee flexion angle during landing was increased following training. There was no change in valgus or flexion moments, but an increase in peak internal rotation moment. This increase in internal rotation moment may increase the risk of ACL injury. However, the increased angle at which the peak internal rotation moment occurred at follow up may mitigate any increase in injury risk by reducing load transmission.

Alasdair R. Dempsey is with the School of Psychology and Exercise Science, Murdoch University, Perth, and with the School of Sport Science, Exercise and Health, University of Western Australia, Perth, WA, Australia. Bruce C. Elliott is with the School of Sport Science, Exercise and Health, University of Western Australia, Perth, WA, Australia. Bridget J. Munro is with the Biomechanics Research Laboratory, University of Wollongong, Wollongong, NSW, Australia. Julie R. Steele is with the Biomechanics Research Laboratory, University of Wollongong, Wollongong, NSW, Australia. David G Lloyd is with the School of Sport Science, Exercise and Health, University of Western Australia, Perth, WA, Australia, and with the Centre for Musculoskeletal Research, Griffith Health Institute, Griffith University, Gold Coast, QLD, Australia. Address author correspondence to Alasdair R. Dempsey at A.Dempsey@murdoch.edu.au.