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Gait

Gait. RLA - Gait Phases. Traditional Phases of Gait. Stance Phase (60%) Heel-strike (contact) Foot-flat Mid-stance point Heel-off Toe-off. Traditional Phases of Gait. Swing Phase (40%) Acceleration: TO  Acceleration Midswing: Acceleration  MSw Deceleration – MSw  Deceleration.

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Gait

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  1. Gait

  2. RLA - Gait Phases

  3. Traditional Phases of Gait Stance Phase (60%) • Heel-strike (contact) • Foot-flat • Mid-stance point • Heel-off • Toe-off

  4. Traditional Phases of Gait Swing Phase (40%) • Acceleration: TO  Acceleration • Midswing: Acceleration  MSw • Deceleration – MSw  Deceleration

  5. Ranchos Los Amigos (RLA) • Traditional references “Reference Limb” only • RLA references both limbs • RLA defines swing intervals more precisely

  6. RLA Stance Phase 60% of Gait Cycle • Loading Response (LR) 0 - 10% [DS] • Midstance (MSt) 10 - 30% • Terminal Stance (TSt) 30-50% • Preswing (PSw) 50-60% [DS]

  7. Instantaneous Events • Initial Contact (IC) • Toe-off (TO)

  8. RLA Swing Phase 40% of Gait Cycle • Initial Swing (Isw) 60 - 73% • Midswing (MSw) 73 - 87% • Terminal Swing (TSw) 87 - 100%

  9. Gait Phases

  10. RLA Locomotor Unit • Pelvis • LE Passenger Unit • HAT

  11. Locomotor Functions Propulsion Stability Shock Absorption Energy Conservation • < 2” displacement

  12. Task A: Weight Acceptance IC LR • IC  opposite foot lifted (end of DS) • 0 - 10%

  13. Task B: Single Limb Support MSt (initiation of SLS) • opposite foot lifted  BW over forefoot • 10 - 30% TSt (completes SLS) • Heel rise of RL  IC of opposite limb • 30 - 50%

  14. Task C: Limb Advancement (Stance) PSw (initiation of second phase of DS) • IC of opposite limb  ipsilateral toe-off • 50 - 60%

  15. Task C: Limb Advancement (Swing) ISw • Toe-off  swing foot is opposite stance limb MSw • Swing limb opposite stance limb  swing limb tibia is vertical

  16. Task C: Limb Advancement (Swing) TSw • vertical tibia  IC

  17. GRFV or Body Vector Effect of body weight HAT COG  COP Relate GRFV to joint centers to determine: • magnitude and direction of joint instability

  18. GRFV HAT COG (T10) GRFV COP

  19. GRFV

  20. Moment External Internal

  21. Ankle ROM

  22. Ankle Moment

  23. Knee ROM

  24. Knee Moment

  25. Hip ROM

  26. Hip Moment

  27. Rockers Heel Ankle Forefoot

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