Gait Flashcards
Define gait cycle
Heel strike to ipsilateral heel strike
Gait cycle is synonymous to _______
Stride
Define step
Heel strike to contralateral heel strike
Stance:swing ratio for walking
60:40
Distance between ipsilateral foot contacts
Stride length
Distance between contralateral foot contacts
Step length
Distance between heel centers of contralateral feet
Step width
Angle formed between long axis of foot and line of progression
Foot angle
Term for steps/min
Cadence
6 steps of stance
- Heel strike/IC
- Foot flat/loading response
- Mid-stance
- Heel off/terminal stance
- Pre-swing
- Toe-off
Two instantaneous events in stance phase
Heel strike/IC and toe-off
Two double support times during stance phase
Foot flat/loading response and pre-swing
3 parts of swing phase
- Acceleration/initial swing
- Midswing
- Deceleration/terminal swing
4 determinants of gait
- knee flexion during loading
- pelvic tilt during swing
- pelvic rotation
- combined knee, ankle and foot
During what part of gait is the body most stable?
Double limb support
During what phase of gait is the body least stable?
Midstance
What side of the body does lateral pelvic tilt occur on?
Swing leg
Goal of lateral pelvic tilt
Keep COG low
Purpose of knee flexion @ midstance
Keep COG low
Serves to lengthen legs and prevent excessive movement of COG
Pelvic rotation (forward and backward)
Forward rotation occurs on ______ side
Swing
Backward rotation occurs on _______ side
Stance
Total pelvic rotation during gait
8º
Kinetic energy is a direct function of ______
Velocity
When is kinetic energy highest?
DLS
When is potential energy highest?
Midstance
High COG = _____ potential energy
High
Relationship between pelvic tilt and gait speed
Increases w speed
Peak hip extension occurs at _______________
Terminal stance
Hip flexion at IC
30º
Knee’s reaction to loading
Flexes to approx 20º
Following IC, what are osteokinematics of ankle?
PF bc eccentric control of tibia
When is DF highest?
Mid-stance
Explain what causes toe drop
No tib ant eccentric control during PF after IC
When does the hip adduct?
During loading
Pattern of pronation/supination during gait
Supination - pronation - supination
Purpose of pronation of foot during stance
Adds flexibility to midfoot
During what part of stance does the foot return to supination?
Late stance
Stance limb ASIS becomes ___________ just before toe-off
Retracted
Shoulder girdle rotates in the __________ direction of the pelvis
Opposite
R shoulder moving anteriorly = _______ rotation
Left
L shoulder moving anteriorly = ______ rotation
Right
Restriction in trunk motion ________ energy expenditure
Increases
During what phase of gait is shoulder most extended?
Heel contact
During what phase of gait is shoulder most flexed?
DLS
Purpose of shoulder movement during gait
Balances rotational forces of trunk
Phase of greatest muscle activity
Loading response
Ability to position leg in WB position
Prepositioning
Excessive PF in stance will _____ stride length and ________ gait velocity
Shorten; reduce
max PF º and phase
30-45º toe off
max DF º and phase
10-15º mid-terminal stance
max hip extension º and phase
10º terminal stance
max hip flexion º and phase
35º midswing
max knee extension ºand phase
0-5º initial contact
max knee flexion ºand phase
60º midswing
max great toe extension º
60º