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Biomechanics foot ankle: Gait

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Biomechanics foot ankle: Gait. Stance Phase Gait 60% of cycle Initial contact Loading response Midstance Terminal Stance Preswing Swing Phase Gait 40% of Cycle Early swing Mid-Swing Terminal Swing. Initial Contact. Ankle jt. is in neutral STJ is slightly supinated

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Presentation Transcript
biomechanics foot ankle gait
Biomechanics foot ankle: Gait
  • Stance Phase Gait 60% of cycle
    • Initial contact
    • Loading response
    • Midstance
    • Terminal Stance
    • Preswing
  • Swing Phase Gait 40% of Cycle
    • Early swing
    • Mid-Swing
    • Terminal Swing
initial contact
Initial Contact
  • Ankle jt. is in neutral
  • STJ is slightly supinated
  • Anterior Tibialis and EDL are on eccentrically
loading response
Loading Response
  • Ankle moves rapidly into 10 degrees PF
  • Pretibial mm action
  • Tibia is pulled anterior
  • Knee flexes
  • STJ-Calcaneus everts 4-6 degrees (closed chain pronation)
  • ?mm controls this
  • Midtarsals?
loading response1
Loading Response
  • Closed Chain Pronation: Loose packed position at STJ and in midtarsal region-allows for shock absorption
    • Calcaneal eversion
    • Talus horizontally adducts
    • Tibia Internally Rotates
    • Knee Flexes
    • Femur internally rotates
midstance
Midstance
  • Ankle DFs to 5-10 degrees
  • Gastroc & Soleus working eccentrically
  • Knee extends near neutral (Gastroc stabilizes the knee)
terminal stance
Terminal Stance
  • Ankle DFs to 10 degrees
  • 1st MTP extends to 30
  • Calf mms still on
  • STJ-supinating
  • Midtarsals?
  • 1st Ray control
  • Knee in full extension
terminal stance1
Terminal Stance
  • Closed chain supination: subtalar joint and midtarsals go into a closed pack position. Makes a rigid lever for push off.
  • Calcaneal inversion
  • Talar horizontal abduction
  • Tibial external rotation
  • Knee extension
  • Femur external rotation
preswing
PreSwing
  • Knee rapidly flexing
  • 1st MTP 30-70 DF
  • Ankle to 20 degrees PF
  • Lift off!
initial swing
Initial Swing
  • Ankle is dorsiflexing:
    • Eccentric contraction of Anterior tibialis, EHL, EDL.
midswing
Midswing
  • Ankle is in neutral position, dorsiflexors are still on.
terminal swing
Terminal Swing
  • Ankle is still in neutral
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