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Increased knee valgus alignment and moment during single-leg landing after overhead stroke as a potential risk factor of anterior cruciate ligament injury in badminton
  1. Yuka Kimura1,
  2. Yasuyuki Ishibashi1,
  3. Eiichi Tsuda1,
  4. Yuji Yamamoto1,
  5. Yoshimitsu Hayashi1,
  6. Shuichi Sato2
  1. 1Department of Orthopaedic Surgery, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
  2. 2Department of Physical Therapy, Aomori University of Health and Welfare, Aomori, Japan
  1. Correspondence to Yuka Kimura, Department of Orthopaedic Surgery, Hirosaki University Graduate School of Medicine, 5 Zaifucho, Hirosaki 036-8562, Japan; yukax10{at}cc.hirosaki-u.ac.jp

Abstract

Background In badminton, knees opposite to the racket-hand side received anterior cruciate ligament (ACL) injuries during single-leg landing after overhead stroke. Most of them occurred in the backhand-side of the rear court. Comparing lower limb biomechanics during single-leg landing after overhead stroke between the forehand-side and backhand-side court may help explain the different injury rates depending on court position.

Hypothesis The knee kinematics and kinetics during single-leg landing after overhead stroke following back-stepping were different between the forehand-side and backhand-side court.

Study design Controlled laboratory study.

Methods Hip, knee and ankle joint kinematic and knee kinetic data were collected for 17 right-handed female college badminton players using a 3-dimensional motion analysis system. Subjects performed single-left-legged landing after an overhead stroke following left and right back-stepping. The kinematic and kinetic data of the left lower extremities during landing were measured and compared between left and right back-steps.

Results Hip flexion and abduction and knee valgus at the initial contact, hip and knee flexion and knee valgus at the maximum knee flexion and the maximum knee valgus moment were significantly larger for the left back-step than the right back-step (p<0.05).

Conclusion Significant differences in joint kinematics and kinetics of the lower extremity during single-leg landing after overhead stroke were observed between different back-step directions. Increased knee valgus angle and moment following back-stepping to the backhand-side might be related to the higher incidence of ACL injury during single-leg landing after overhead stroke.

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Footnotes

  • Funding This study was funded by research grants from the Japanese Society for the Promotion of Science (#16300198 and #21500676) and the Japanese Sports Medicine Foundation (2006 and 2007).

  • Competing interests None.

  • Patient consent Obtained for figures 1 and 7 and the supplementary video.

  • Ethics approval This study was conducted with the approval of the Hirosaki University Graduate School of Medicine Institutional Review Board.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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