gait. rla - gait phases traditional phases of gait stance phase (60%) heel-strike (contact) ...
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Gait
RLA - Gait Phases
Stride (100%)Stance (60%) Swing (40%)
LoadingResponse(0 - 10%)
Midstance(10 - 30%)
Terminal Stance(30-50%)
Pre-Swing
(50-60%)
InitialSwing
(60-73%)
Midswing(73-87%)
TerminalSwing
(87-100%)DoubleSupport(10%)
DoubleSupport(10%)
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
Ranchos Los Amigos (RLA)
Traditional references “Reference Limb” only
RLA references both limbs
RLA defines swing intervals more precisely
RLA Stance Phase
60% of Gait CycleLoading Response (LR) 0 - 10% [DS]Midstance (MSt) 10 - 30%Terminal Stance (TSt) 30-50%Preswing (PSw) 50-60% [DS]
Instantaneous Events
Initial Contact (IC)
Toe-off (TO)
RLA Swing Phase
40% of Gait CycleInitial Swing (Isw) 60 - 73%Midswing (MSw) 73 - 87%Terminal Swing (TSw) 87 - 100%
Gait Phases
RLA
Locomotor UnitPelvisLE
Passenger UnitHAT
Locomotor Functions
PropulsionStabilityShock AbsorptionEnergy Conservation< 2” displacement
Task A: Weight Acceptance
IC
LRIC opposite foot lifted (end of DS)
0 - 10%
Task B: Single Limb Support
MSt (initiation of SLS)opposite foot lifted BW over forefoot10 - 30%
TSt (completes SLS)Heel rise of RL IC of opposite limb30 - 50%
Task C: Limb Advancement (Stance)
PSw (initiation of second phase of DS)IC of opposite limb ipsilateral toe-
off50 - 60%
Task C: Limb Advancement (Swing)
ISwToe-off swing foot is opposite
stance limb
MSwSwing limb opposite stance limb
swing limb tibia is vertical
Task C: Limb Advancement (Swing)
TSwvertical tibia IC
GRFV or Body Vector
Effect of body weight
HAT COG COP
Relate GRFV to joint centers to determine:
magnitude and direction of joint instability
GRFV
HAT COG (T10)
COP
GRFV
GRFV
Moment
External
Internal
Ankle ROM
Ankle Moment
Knee ROM
Knee Moment
Hip ROM
Hip Moment
Rockers
Heel
Ankle
Forefoot
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