MIDSTANCE Flashcards
during midstance, the OMTJ is _____? due too? causes?
pronated
vertical GRFs pushing upward on forefoot
dorsiflexion and abduction of the forefoot and pronation around the OMTJ
at the end of contact period, the LMTJ axis supinated or pronated?
what else happens during this motion?
supinated due to STJ pronation
now STJ is supinating and LMTJ is pronating
when the calcaneus inverts, the forefoot will evert about the LMTJ axis until forefoot locks
because the OMTJ axis is pronated and LMTJ is pronating the foot is now charging from a mobile adapter during contact period to a rigid lever in anticipation of propulsion
T/F, leg externally rotates throughout the midstance period, from beginning to end
T
external rotations of the leg accompanies _____?
STJ supination
what causes external limb rotation?
calf muscles
STJ supination continues on in what phases?
midstance and into propulsive period
as we progress forward, the ankle moves how? how many degrees?
dorsiflexing with heel in contact with ground
10 degrees to the leg at end of midstance
knee is flexed during what period? extend?
end of contact period
start of midstance and continues throughout midstance to help lift body weight and also decreases vertical GRFs
when does the hip extend?
during contact due to progression of body weight forward and continues throughout midstance
when do the GRFs decrease?
after the start of midstance reaching a low point during the midpoint of midstance then increasing again
T/F, there is peak in vertical GRF during midetance?
F, there is not
what is the single limb support?
only during the midstance period
where do we see the center of gravity?
2 planes
transverse plane - shifts it medial to lateral as STJ supinates
sagittal plane - moved anteriorly with controlled forward fall
what happens to the opposite limb as we progress forward on the stance phase limb?
we transport the opposite limb forward and prepare for the contact phase of the opposite limb