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The effect of changing toe direction on knee kinematics during drop vertical jump: a possible risk factor for anterior cruciate ligament injury

  • Knee
  • Published:
Knee Surgery, Sports Traumatology, Arthroscopy Aims and scope

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.

Conflict of interest

All authors have no conflicts of interest to declare.

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Correspondence to Masanori Yamanaka.

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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

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