Abstract
Purpose
The purpose of this study was to examine the effect of changing toe direction on knee kinetics and kinematics associated with anterior cruciate ligament injury during drop vertical jumps.
Methods
Fourteen females performed drop vertical jumps under three toe conditions (natural, toe-in, and toe-out). The knee kinetics and kinematics during landing were evaluated using a motion analysis system. Results under three toe conditions were compared using a one-way repeated measures analysis of variance and a post hoc Bonferroni test.
Results
Toe-in landing was associated with a significantly greater knee abduction angle, tibial internal rotation angle, and knee abduction moment than the natural and toe-out conditions. Toe-out landing was associated with significantly greater tibial internal rotational angular velocity.
Conclusions
Changing toe direction significantly affects knee kinetics and kinematics during landing. It is important to avoid changing toe direction excessively inward or outward during landing to prevent the increases in knee abduction and tibial internal rotation which might increase the risk of ACL injury.
Level of evidence
Prognosis, Level IV.
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Acknowledgments
The authors thank Prof. Junko Fukushima for her suggestions in the preparation of this article.
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Ishida, T., Yamanaka, M., Takeda, N. et al. The effect of changing toe direction on knee kinematics during drop vertical jump: a possible risk factor for anterior cruciate ligament injury. Knee Surg Sports Traumatol Arthrosc 23, 1004–1009 (2015). https://doi.org/10.1007/s00167-013-2815-2
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DOI: https://doi.org/10.1007/s00167-013-2815-2