Phases of Walking:
Summary of Muscle Function in Level Walking
Muscle Group | Main Function | Abnormalities if Weak |
Hip Flexors | Acceleration of Swing | Backward lurch and pelvic tilt to initiate swing as seen in hemiplegia |
Hip Abductors | Stabilize pelvis in stance Control drop of pelvis | Trendelenburg or contralateral hip drop |
Hip Extensor | Stabilize pelvis, and stance | Backward lurch, or jacknife with quick step on contralateral side |
Quadriceps | Absorb shock at heel strike and support knee at stance | Lock knee during stance and tendency to hyperextend |
Hamstrings | Deceleration of swing phase | May overshoot at end of swing and "slam into extension" |
Ankle DF & Toe Extensors | Control foot hitting the ground "slap" and lift the foot during swing | Steppage gait, toe-heel gait, vault up on opposite leg or circumduct around |
Ankle PF & Toe Flexors | Push off at the end of stance phase | Absence of push off and small steps with poor balance and slow speed |
- Hip Flexors start the swing
- Hip Extensors, especially hamstrings, decelerate the leg at the end of swing
- Knee extensors contract eccentrically at heel-strike to prevent buckling of knee
- Dorsiflexors act to hold toe off floor during swing, and to prevent foot slap at heel strike (act to slow plantar flexion), another eccentric contraction
- Plantar flexors act during push off
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