Swing Phase of Gait

- See: Gait Menu: and Muscle Activity During Gait

- Discussion:
    - during swing, the ankle dorsiflexes by the concentric contraction of anterior tibialis muscle;
    - all other muscles are silent;
    - momentum generated by the gastrocsoleus and hip flexors at terminal stance carries the leg forward
    - during initial swing phase knee passively flexes and then knee passively extends at end of swing phase;
    - sub-talar joint assumes near neutral position, & toes dorsiflex slightly as foot prepares for next episode of stance;
    - once toe leaves the ground;
    - contraction of the quadriceps, initiated before toe off, apprarently serves two purposes;
           - it prevents heel from rising too high in a posterior direction;
           - it helps to initiate the forward swing of the leg;
    - during latter part of swing phase, slightly before heel strike:
    - hamstrings muscles become active;
           - function of the hamstring muscles at this time is to decelerate forward swing of leg and thereby control the position of the foot at heel strike

Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Friday, September 9, 2011 12:18 pm