Gait 3 Flashcards
midstance: ankle GRF
anterior
What does GRF anterior to the ankle at mid stance allow?
DF
midstance: knee GRF
centered
midstance: hip GRF
centered
midstance: ankle movement
slight PF (3˚) to slight DF (5˚)
midstance: knee movement
neutral (0-5˚ flexion)
midstance: hip movement
slight flexion
midstance: ankle muscles and actions
- gastroc
- eccentric
midstance: knee muscles and actions
- quads
- concentric
midstance: hip muscles and actions
- hip ABD
- isometric
What does eccentric contraction of gastrocs do at mid stance?
prevents excessive tibial translation
function of quad concentric contraction at knee
stabilizes the knee
midstance: ABD contraction function
prevents Trendelenburg gait pattern
terminal stance =
heel off
terminal stance: ankle GRF
anterior to ankle
terminal stance: knee GRF
anterior to knee
terminal stance: hip GRF
posterior to hip
terminal stance: ankle movement
DF (5-10˚)
terminal stance: knee movement
neutral
terminal stance: hip movement
extension
terminal stance: ankle muscles and actions
- gastroc
- eccentric
terminal stance: knee muscles and actions
- kinda just hanging out
- momentum
terminal stance: hip muscles and actions
- kinda just hanging out
- momentum
preswing =
toe off
preswing: ankle GRF
anterior, but then gone
preswing: knee GRF
none
preswing: hip GRF
none
preswing: ankle movement
PF (5-10˚)
preswing: knee movement
flexion (~60˚)
preswing: hip movement
flexion (~20˚)
preswing: ankle muscles and action
- TA
- concentric
preswing: knee muscles and action
- hamstrings
- concentric
preswing: hip muscles and action
- hip flexors
- concentric
If the TA isn’t working properly at preswing, what would this look like?
toe drag
Why do the muscles act concentrically at preswing?
- needed for limb advancement
- once we’re past GRFs and have gravity acting on limb
