Beginning of stance when heel or some other portion of foot contacts ground

Component of initial double limb stance

Body weight rapidly loads onto lead limb from trailing limb

Hip remains stable, knee flexes to absorb shock and forefoot lowers to ground

Immediately follows initial contact and is final component of initial double limb stance

Ends when opposite limb lifts from ground for swing

Trunk progresses from behind in front of ankle over single stable limb

First half of single limb support

Starts when contralateral foot kifts from ground for swing

Trunk continues forward progression relative to foot

Heel rises from ground and limb achieves trailing limb posture

Second half single limb support

Ends with contralateral initial contact

Body weight rapidly unloads from reference limb anf reference limb prepares for swing during this terminal double limb stance period

Starts with contralateral initial contact and ends at ipsilateral limb toe off

Starts when reference foot lifts from ground

Hip, knee and ankle rapidly flex for clearance and advancement during this initial 1/3 of swing

Thigh continues advancing, knee begins to extend, and ankle achieves neutral posture during this middle 1/3 of swing

During this final 1/3 of swing, knee achieves maximal extension and ankle remains at neutral in preparation for heel first initial contact

Ends when foot contacts ground

Beginning of stance when heel first contacts ground

Immediately follows heel strike when sole of foot contacts floor

Point at which body passes directly over reference extremity

Point following heel off when reference limb’s toe is contacting ground

Point following midstance when refernce limb’s heel leaves ground

Beginning portion of swing from reference limb toe off to point when reference limb is directly under the body

Portion of swing when reference limb passes directly below body

Extends from the end of acceleration to beginning of deceleration

Portion of swing when reference limb is decelerating in preparation for heel strike