Limited hip and knee flexion during landing is associated with increased frontal plane knee motion and moments.

Clinical Biomechanics
C D PollardChristopher M Powers

Abstract

It has been proposed that female athletes who limit knee and hip flexion during athletic tasks rely more on the passive restraints in the frontal plane to deceleration their body center of mass. This biomechanical pattern is thought to increase the risk for anterior cruciate ligament injury. To date, the relationship between sagittal plane kinematics and frontal plane knee motion and moments has not been explored. Subjects consisted of 58 female club soccer players (age range: 11-20 years) with no history of knee injury. Kinematics, ground reaction forces, and surface electromyography were collected while each subject performed a drop landing task. Subjects were divided into two groups based on combined sagittal plane knee and hip flexion angles during the deceleration phase of landing (high flexion and low flexion). Subjects in the low flexion group demonstrated increased knee valgus angles (P=0.02, effect size 0.27), increased knee adductor moments (P=0.03, effect size 0.24), decreased energy absorption at the knee and hip (P=0.02, effect size 0.25; and P<0.001, effect size 0.59), and increased vastus lateralis EMG when compared to subjects in the high flexion group (P=0.005, effect size 0.35). Female athletes with limited sa...Continue Reading

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Citations

Sep 14, 2010·Journal of Athletic Training·Sandra J ShultzSusan M Sigward
Sep 14, 2010·Journal of Athletic Training·Christopher M Powers, Beth Fisher
Dec 7, 2013·Journal of Athletic Training·J Troy BlackburnSteven M Zinder
Mar 15, 2013·The Journal of Orthopaedic and Sports Physical Therapy·Beth E FisherChristopher M Powers
Feb 2, 2010·The Journal of Orthopaedic and Sports Physical Therapy·Christopher M Powers
Mar 29, 2014·The Journal of Orthopaedic and Sports Physical Therapy·Christopher M PowersShawn Farrokhi
Apr 15, 2014·Journal of Bodywork and Movement Therapies·Craig Liebenson
Feb 27, 2014·The Journal of Orthopaedic and Sports Physical Therapy·Rodrigo de Marche BaldonSara Regina Piva
Feb 10, 2016·Clinical Biomechanics·Hayley M EricksenBrian Pietrosimone
Jul 8, 2014·Clinical Biomechanics·Melissa M MontgomeryRandy J Schmitz
Mar 24, 2016·Gait & Posture·Tracy L ZaslowTishya A L Wren
Dec 1, 2015·Physical Medicine and Rehabilitation Clinics of North America·Robert L Baker, Michael Fredericson
Oct 17, 2012·Physical Therapy in Sport : Official Journal of the Association of Chartered Physiotherapists in Sports Medicine·Allan MunroPaul Comfort
Jan 10, 2012·Journal of Biomechanics·Eirik KristianslundAntonie J van den Bogert
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Jan 8, 2011·Scandinavian Journal of Medicine & Science in Sports·S M SigwardC M Powers
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May 18, 2012·Gait & Posture·Valentina GraciGretchen B Salsich
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Jul 6, 2010·The American Journal of Sports Medicine·Javad HashemiBruce D Beynnon

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