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Flashcards in Gait 3 Deck (14)
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1

How is kinetic energy of the falling COM converted into forward progression?

- Heel rocker

- Ankle rocker

- Forefoot rocker

(Closed kinetic chain function of muscles important in gait)

2

How does the heel rocker convert momentum of the falling COM into forward progression:

(3 step chain)

1) Hell acts as a fulcrum causing foot to plantar flex

2) Action of the pre-tibials ties the tibia to the falling foot

3) Action of the quadriceps ties the femur to the tibia no draws the body forward

3

Describe the ankle rocker mechanism:

- Ankle joint becomes the fulcrum
- Momentum of the tibia advances the body vector forward along the foot
- - Controlled by soleus

4

Describe the forefoot rocker mechanism:

- Body vector progresses beyond metatarsal heads and heel rises
- Forward progression is accelerated as COM falls beyond BOS

5

Name the phases of stance and percentages:

Initial contact: 0 - 2%
Loading response: 0 - 10%
Mid stance: 10 - 30%
Terminal stance: 30 - 50%

6

Initial Contact -
Interval:
Event markers:

IC:

Interval: 0 - 2% of gait cycle
- The moment when the foot just touches the floor

Event markers:
Event 1: Initial Contact (IC)
- The first point of contact of the outstretched limb with the ground

7

Initial contact -
Objective:
Critical action:

IC

Objective:
- The limb is positioned to start the next stance phase
- The foot is positioned to utilise the heel rocker

Critical Action:
- Heel first contact

8

Loading response:

Interval:

Event markers:

LR:

Interval: 0 - 10% of gait
- Begins with the initial floor contact and continues until the other foot is lifted for swing

Event markers:
- E1: Initial contact (IC)
- E2: Opposite toe off (OT)

9

Loading response:

Objectives:

Critical actions:

LR

Objectives:
- Shock absorption
- Weight bearing stability
- Preservation of forward progression

Critical actions:
- Hip stability
- Controlled knee flexion and plantar flexion

10

Mid stance

Interval:

Event markers:

Interval: 10 - 30% of gait cycle
- Begins as the other foot is lifted and continues until body weight is aligned over the forefoot

Event makers:
- E2 Opposite toe off (OT)
- E3 Heel rise (HR) opposite foot adjacent

11

Terminal Stance

Interval:

Event Markers:

Interval: 30 - 50% of gait cycle
- Begins with heel rise and continues until the other foot strikes the ground

Event markers
E3: Heel rise (HR)
E4: Opposite Initial contact

12

Terminal stance

Objective:

Critical actions

Terminal Stance

Objective: progression of the body beyond the supporting foot

Critical Actions:
- Ankle locked in dorsiflexion with heel rise (forefoot rocker)
- Stance limb trails behind

13

Pre Swing

Interval:

Event markers:

Pre Swing

Interval: 50 - 60% of gait cycle
- Begins with initial contact of opposite limb and ends with ipsilateral toe-off

Event markers:
- E4: Opposite initial contact
- E5: Toe off (TO)

14

Pre-Swing

Objective:

Critical Action:

Pre-Swing

Objective: Position the limb for swing

Critical Action: Passive knee flexion to 40 degrees