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Multi-plane, multi-joint lower extremity support moments during a rapid deceleration task: Implications for knee

Jeffery T Podraza1, Scott C White2, Dan K Ramsey3

  • 1Department of Physical Therapy, D'Youville College, Buffalo, NY, United States; Department of Exercise and Nutrition Sciences, University at Buffalo, Buffalo, NY, United States.

Human Movement Science
|February 16, 2018
PubMed
Summary

Landing with greater knee flexion increases injury risk by altering lower limb support moments. Hip joint moments are crucial for balancing knee moments during rapid deceleration landings.

Keywords:
ACLImpact-like decelerationLower extremity support momentsNon-contact ACL injuryThree dimensional joint moments

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Human Movement Science

Background:

  • Understanding lower limb support strategies during rapid deceleration is key to injury prevention.
  • Hip, knee, and ankle moments contribute to overall limb support during impact-like movements.

Purpose of the Study:

  • To investigate the contribution of hip, knee, and ankle moments to limb support moments (LSMs) during single-limb, impact-like deceleration landings.
  • To analyze how different knee flexion angles affect these joint moments and overall limb support.
  • To provide insight into injury mechanisms and avoidance strategies.

Main Methods:

  • Twenty subjects performed single-limb deceleration landings at three knee flexion ranges: 0-25°, 25-50°, and 50-75°.
  • Kinematic and kinetic data were collected to calculate hip, knee, and ankle moments in three planes.
  • Repeated measures ANOVA compared LSMs and individual joint moment contributions at initial contact (IC) and 50 ms post-IC.

Main Results:

  • No significant differences in overall LSMs at IC across knee flexion angles.
  • Significant changes in LSMs occurred within 50 ms post-IC with deeper knee flexion.
  • Greater knee flexion led to increased extensor LSMs, reduced knee valgus resistance, and decreased internal tibial rotation support.

Conclusions:

  • The role of individual joint moments rapidly evolves post-landing, influenced by initial knee flexion.
  • Hip and ankle moment contributions are dependent on the degree of limb flexion at landing.
  • Hip joint moments play a critical role in stabilizing potentially injurious knee moments across all landing conditions.