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Related Experiment Videos

Frontal plane knee angle affects dynamic postural control strategy during unilateral stance.

John Nyland1, Steve Smith, Kurt Beickman

  • 1Division of Sports Medicine, Department of Orthopaedic Surgery, University of Louisville, Louisville, KY 40292, USA. john.nyland@louisville.edu

Medicine and Science in Sports and Exercise
|July 20, 2002
PubMed
Summary

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Individuals with genu varus or valgus demonstrate altered center of plantar pressure (COPP) during single leg stance. This suggests increased reliance on ankle plantar flexor muscles for dynamic postural control in these populations.

Area of Science:

  • Biomechanics
  • Human Movement Science
  • Orthopedics

Background:

  • Postural control relies on complex sensorimotor integration.
  • Ankle plantar flexor muscles play a crucial role in maintaining balance.
  • Frontal plane tibiofemoral joint angulation (genu varus/valgus) may influence postural control strategies.

Purpose of the Study:

  • To investigate the relationship between frontal plane tibiofemoral joint angulation and center of plantar pressure (COPP) location.
  • To assess COPP during vision-denied single leg stance in individuals with varying degrees of genu varus and valgus.
  • To understand how knee alignment affects dynamic postural control mechanisms.

Main Methods:

  • Two-dimensional videography was used to measure frontal plane tibiofemoral joint angulation and foot angle in 56 nonimpaired athletes.

Related Experiment Videos

  • Center of plantar pressure (COPP) was recorded during a 15-second single leg stance under vision-denied conditions.
  • One-way ANOVA and Tukey HSD tests were employed to analyze group differences.

    • Main Results:

    • Subjects with genu varus or valgus (>= 5 degrees) exhibited a more rearfoot-directed mean anterior-posterior COPP compared to those with less angulation.
    • Groups with genu varus or valgus displayed greater mean plantar force magnitude relative to body weight.
    • No significant differences were found in mean ankle plantar flexor moment magnitudes between groups.

    Conclusions:

    • Frontal plane knee alignment (genu varus/valgus) is associated with altered COPP during single leg stance.
    • Individuals with genu varus or valgus appear to utilize subtalar and midtarsal joint control more extensively.
    • This suggests a compensatory reliance on ankle plantar flexor muscle groups for dynamic postural control in the presence of knee malalignment.