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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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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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