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) zTraditional references “Reference Limb” only zRLA references both limbs zRLA defines swing intervals more precisely

6. RLA Stance Phase 60% of Gait Cycle zLoading Response (LR) 0 - 10% [DS] zMidstance (MSt) 10 - 30% zTerminal Stance (TSt) 30-50% zPreswing (PSw) 50-60% [DS]

7. Instantaneous Events zInitial Contact (IC) zToe-off (TO)

8. RLA Swing Phase 40% of Gait Cycle zInitial Swing (Isw) 60 - 73% zMidswing (MSw) 73 - 87% zTerminal Swing (TSw) 87 - 100%

9. Gait Phases

10. RLA Locomotor Unit zPelvis zLE Passenger Unit zHAT

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

12. Task A: Weight Acceptance IC LR zIC  opposite foot lifted (end of DS) z0 - 10%

13. Task B: Single Limb Support MSt (initiation of SLS) zopposite foot lifted  BW over forefoot z10 - 30% TSt (completes SLS) zHeel rise of RL  IC of opposite limb z30 - 50%

14. Task C: Limb Advancement (Stance) PSw (initiation of second phase of DS) zIC of opposite limb  ipsilateral toe-off z50 - 60%

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

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

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

18. GRFV HAT COG (T10) COP 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