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Technical Details

  • Variable Type: Discrete Metric
  • Data Type: Float
  • Units: meters (m)
  • Column Name: Varies by event/phase (see Events/Phases)
  • Measurement: Medial displacement of the knee
  • Direction: outward positive (+), inward negative (-)

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Events / Phases

This metric can be reported at different events or phases depending on jump type:
  • At Bottom: At the Bottom event (lowest pelvis before the jump).
    • Column examples: right_knee_valgus_at_bottom, left_knee_valgus_at_bottom.
  • At Landing: At the Landing event (first ground contact after flight).
    • Column examples: right_knee_valgus_at_landing, left_knee_valgus_at_landing.
  • At Landing Bottom: At the Landing Bottom event (deepest absorption after landing).
    • Column examples: right_knee_valgus_at_landing_bottom, left_knee_valgus_at_landing_bottom.
  • Landing Full (max during landing phase): Maximum valgus from Landing to Termination.
    • Column examples: right_knee_valgus_full_landing, left_knee_valgus_full_landing.

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Description

Knee valgus measures the amount of medial (inward) knee motion at or between specific time points during the jump. Excessive knee valgus motion (lower than 0.05 m or about 2 inches) is associated with increased injury risk and suboptimal loading. Knee valgus is reported separately for left and right in bilateral jumps; single-leg jumps may report one side. The event or phase determines which column name applies.

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Use Cases

  • Injury risk screening
  • Movement quality and knee control
  • Bilateral comparison
  • Landing mechanics and ACL risk