Initial contact hip muscle action

Extensors, Abductors, and Adductors isometrically contract to STABLIZE

Initial contact knee muscle action

Extensors/flexors isometrically contract

Initial contact ankle muscle action

Dorsiflexors Isometrically contract to maintain neutral position

Loading response hip muscle action

Extensors and Adductors isometrically contract to maintain hip position Abductors contract eccentrically to limit lateral pelvic tilting

Loading response ankle muscle action

DF contract eccentrically Late in the phase, PF contract

Midstance hip muscle action

Glute med isometrically contracts to maintain hip/pelvic position Iliopsoas contract eccentrically to control hip extension

Midstance ankle muscle action

ROM moves from 5 PF to 5 DF PF contracts eccentrically to control DF

Terminal stance hip muscle action

Iliopsoas contract eccentrically to control hip extension Abductors continue to stabilize

Terminal stance ankle muscle action

Initially PF contract eccentrically then, rapidly switch to concentric

Pre swing hip muscle action

Flexors begin to work concentrically (flexion aids with knee flexion)

Pre swing knee muscle action

Momentum of body, hamstrings, and PF aid in knee flexion

Pre swing ankle muscle action

PF activity ends DF begin to activate to allow for foot clearance

Initial swing hip muscle action

Flexors continue to concentrically contract

Initial swing knee muscle action

Hip flexion continues to contribute to knee flexion hamstrings concentrically contract to assist knee flexion (greatest amount of knee flexion

Initial swing ankle muscle action

DF contract concentrically Ankle DF from 15 PF -> 5 PF

Midswing hip muscle action

flexors cont. to work concentrically but activity decreases Momentum of tibia aids in hip flexion (greatest amount of hip flexion)

Midswing knee muscle action

Extends from 60 flex-> 25 flex Momentum of tibia contributes to knee extension hamstrings contract eccentrically to control knee extension Tibia moves vertically

Midswing ankle muscle action

DF contract isometrically Ankle in neutral Allows for foot clearance

Terminal swing hip muscle action

Pelvis is anteriorly rotated 5 degrees Hamstrings decelerate limb Glute max and adductors isometrically contract

Terminal swing Knee muscle action

Extending from 25 flex-> 5 flex Momentum of tibia assist in knee ext. Quad concentric contraction Hamstring eccentrically contract to control knee ext.

Terminal swing ankle muscle action

DF cont. to contract isometrically Prepping for initial contact

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Muscle working gait

FMA

Question	Answer
Initial contact hip muscle action	Extensors, Abductors, and Adductors isometrically contract to STABLIZE
Initial contact knee muscle action	Extensors/flexors isometrically contract
Initial contact ankle muscle action	Dorsiflexors Isometrically contract to maintain neutral position
Loading response hip muscle action	Extensors and Adductors isometrically contract to maintain hip position Abductors contract eccentrically to limit lateral pelvic tilting
Loading response knee muscle action	Quads contract eccentrically
Loading response ankle muscle action	DF contract eccentrically Late in the phase, PF contract
Midstance hip muscle action	Glute med isometrically contracts to maintain hip/pelvic position Iliopsoas contract eccentrically to control hip extension
Midstance knee muscle action	minimal activity
Midstance ankle muscle action	ROM moves from 5 PF to 5 DF PF contracts eccentrically to control DF
Terminal stance hip muscle action	Iliopsoas contract eccentrically to control hip extension Abductors continue to stabilize
Terminal stance knee muscle action	minimal activity
Terminal stance ankle muscle action	Initially PF contract eccentrically then, rapidly switch to concentric
Pre swing hip muscle action	Flexors begin to work concentrically (flexion aids with knee flexion)
Pre swing knee muscle action	Momentum of body, hamstrings, and PF aid in knee flexion
Pre swing ankle muscle action	PF activity ends DF begin to activate to allow for foot clearance
Initial swing hip muscle action	Flexors continue to concentrically contract
Initial swing knee muscle action	Hip flexion continues to contribute to knee flexion hamstrings concentrically contract to assist knee flexion (greatest amount of knee flexion
Initial swing ankle muscle action	DF contract concentrically Ankle DF from 15 PF -> 5 PF
Midswing hip muscle action	flexors cont. to work concentrically but activity decreases Momentum of tibia aids in hip flexion (greatest amount of hip flexion)
Midswing knee muscle action	Extends from 60 flex-> 25 flex Momentum of tibia contributes to knee extension hamstrings contract eccentrically to control knee extension Tibia moves vertically
Midswing ankle muscle action	DF contract isometrically Ankle in neutral Allows for foot clearance
Terminal swing hip muscle action	Pelvis is anteriorly rotated 5 degrees Hamstrings decelerate limb Glute max and adductors isometrically contract
Terminal swing Knee muscle action	Extending from 25 flex-> 5 flex Momentum of tibia assist in knee ext. Quad concentric contraction Hamstring eccentrically contract to control knee ext.
Terminal swing ankle muscle action	DF cont. to contract isometrically Prepping for initial contact

Created by: ZanderLuna

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