biomechanics of the foot Flashcards
T/f foot provides somatosensory input for feedback and feedforward movemetn
yes
3 ways foot provides feedback
anatomical features (joints with different stability / mobility)
dissociated / selective movement (stability for mobility)
Feedback producing feedforward (to SC for right mm activity)
normal walking speed
3.6-4.5 km/hour
60 strides/minute
parts of gait
initial contaact loading response mid stance terminal stance swing`
Initial contact wheres GRF, subtalar and what mm
GRF through posterior calcaneus
Subtalar joint in supinated
mm tib ant, EDL, EHL
loading response
subtler
ankle begins to PF
subtler beings pronating
transfer load to lateral foot
main supports during loading reponse
long and short plantar ligaments
mm during loading response
gastrocs, soleus, TP, FDL, FHL
midstance COM
Com traves from posterior postion to ankle joint axis (loading mid tarsal region)
COM travels lateral to medial foot
at midstance lengthening and flattening of foot produced by
body weight - GRF subtalar position DF at inter tarsal / tarsometatarsal joints DF and inversion at 1 TMT DF and eversion at 4/5 TMT ST reaches max pronation and supinates
midstanace mm activity
gastrocs / soleus deep posterior tibial group peroneii lumbricals FHL
terminal stance subtler position
supination
whats happening at terminal stance
TC PF
TMT PF
Toes extend
Plantar fascia tightens
1 MTP terminal stance function
posterior glides
toe off occurs at 65 deg ext
terminal stance mm activty
gastroc soleus peroneus longus / brevis tib post FHL intrinsics
functional tasks for walking
weight acceptance
single leg support
limb advancement
push off
initiation of walking functional tasks
double leg support
get hip flexors going
let go of hip extensors
functional tasks of contact phase of walking
heal contact to forefoot load
weight acceptation
shock absoption
midstance functional tasks
single leg stance
from SLS progress pelvis and trunk
what is most unstable position
terminal stance, propulsive phase
movements of trunk
horizontal and vertical displacement
rotation
T/f trunk is a determinant of gait
yes
total rotational excursions is about __
7 degs
where should shoulders be during the arm swing
neutral
purpose of arm swing
counteract lateral instability
indications for ortotics
take pressure of f injury
improve function of foot to decrease stress
balance intrinsic mm deformities
are my orthotics ok
check knee tracking when on orthotics and off
extend 1st MTP to see resistance with and with our orthotic
patient supine see where 1 MTP extended is limited by orthotic
