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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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Presentation Transcript
traditional phases of gait
Traditional Phases of Gait

Stance Phase (60%)

  • Heel-strike (contact)
  • Foot-flat
  • Mid-stance point
  • Heel-off
  • Toe-off
traditional phases of gait4
Traditional Phases of Gait

Swing Phase (40%)

  • Acceleration: TO  Acceleration
  • Midswing: Acceleration  MSw
  • Deceleration – MSw  Deceleration
ranchos los amigos rla
Ranchos Los Amigos (RLA)
  • Traditional references “Reference Limb” only
  • RLA references both limbs
  • RLA defines swing intervals more precisely
rla stance phase
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]
instantaneous events
Instantaneous Events
  • Initial Contact (IC)
  • Toe-off (TO)
rla swing phase
RLA Swing Phase

40% of Gait Cycle

  • Initial Swing (Isw) 60 - 73%
  • Midswing (MSw) 73 - 87%
  • Terminal Swing (TSw) 87 - 100%
slide10
RLA

Locomotor Unit

  • Pelvis
  • LE

Passenger Unit

  • HAT
locomotor functions
Locomotor Functions

Propulsion

Stability

Shock Absorption

Energy Conservation

  • < 2” displacement
task a weight acceptance
Task A: Weight Acceptance

IC

LR

  • IC  opposite foot lifted (end of DS)
  • 0 - 10%
task b single limb support
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%
task c limb advancement stance
Task C: Limb Advancement (Stance)

PSw (initiation of second phase of DS)

  • IC of opposite limb  ipsilateral toe-off
  • 50 - 60%
task c limb advancement swing
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
task c limb advancement swing16
Task C: Limb Advancement (Swing)

TSw

  • vertical tibia  IC
grfv or body vector
GRFV or Body Vector

Effect of body weight

HAT COG  COP

Relate GRFV to joint centers to determine:

  • magnitude and direction of joint instability
slide18
GRFV

HAT COG (T10)

GRFV

COP

moment
Moment

External

Internal

rockers
Rockers

Heel

Ankle

Forefoot