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Vertical drop jump landing depth influences knee kinematics in female recreational athletes

Journal article
Authors S. R. Augustsson
Roy Tranberg
Roland Zügner
J. Augustsson
Published in Physical Therapy in Sport
Volume 33
Pages 133-138
ISSN 1466-853X
Publication year 2018
Published at Institute of Clinical Sciences, Department of Orthopaedics
Pages 133-138
Language en
Links dx.doi.org/10.1016/j.ptsp.2018.08.0...
Keywords Biomechanics, Knee valgus, Muscle strength, Hip internal rotation, cruciate ligament injury, neuromuscular control, handball players, risk, strength, valgus, biomechanics, reliability, task, Rehabilitation, Sport Sciences
Subject categories Orthopedics

Abstract

Objectives: To examine whether different vertical drop jump (VDJ) landing depth (small versus deep) and stance width (wide versus narrow) may alter movement biomechanics in female recreational athletes. The purpose was also to identify whether leg muscle strength is a predictive factor for knee control during a VDJ. Main outcome measures: Three VDJ tests were used for biomechanical analysis: 1) small "bounce" jump (BJ), 2) deep "countermovement" jump with wide (CMJW) and 3) narrow foot position (CMJN). Subjects also performed an isometric knee-extension strength test, dichotomized to 'weak' versus 'strong' subjects according to median and quartiles. Results: There were greater knee valgus angles during landing for both the CMJW and CMJN test compared to the BJ test (p <= 0.05). Differences in knee valgus between weak and strong subjects were significant for the BJ test (p = 0.044) but not for any of the other tests. Conclusions: VDJ landing depth influences knee kinematics in women. Landing depth may therefore be considered when screening athletes using the VDJ test. Also, muscle strength seems to influence the amount of knee valgus angles, but the difference was not statistically significant (except for the BJ test) in this small cohort. (C) 2018 Elsevier Ltd. All rights reserved.

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