KINES: Normal Gait Flashcards
define locomotion
body is transported from one place to another
explain how locomotion happens
translatory progression thought coordinated movements of hip, knee, ankle and trunk and UE
define gait
upright locomotion by means of walking, jogging, running
define walking
gait in upright bipedal form
define ambulation
for clinical setting - whether person can wall w or w/o external assistance
major tasks of gait
maintain support of hat, upright posture, balance
control foot trajectory
generation of forward velocity
absorption of energy from GRF
decrease forward velocity
comprises 60% of total gait cycle
stance phase
comprises 40% of total gait cycle
swing phase
what does stance phase mean
reference foot is is contact w ground
traditional phases of stance phase of gait
heel strike - foot flat - midstance - heel off - toe off
RLA phases of stance phase of gait
initial contact - loading response - midstance - terminal stance - pre-swing
what is swing phase
where reference foot is no in contact w the ground
traditional phases of swing phase of gait
acceleration - midswing - deceleration
RLA phases of swing phase of gait
initial swing - midswing - terminal swing
define gait cycle
from R initial contact to R initial contact
discuss the timing on contralateral limb
ipsi - initial contact
end of terminal stance
discuss the timing on contralateral limb
ipsi - loading respinse
pre swing
discuss the timing on contralateral limb
ipsi - midstance
midswing
discuss the timing on contralateral limb
ipsi - terminal stance
terminal swing - initial contact
discuss the timing on contralateral limb
ipsi - pre-swing
initial response to loading response
define stance time
during stance phase of one extremity
define single support time
only one extremity is on ground - 2 instances in one gait cycle
right mid to terminal and left mid to terminal
define double support time
when both feet are on the ground - twice in once cycle
prior to loading response - 22% of entire cycle
define cadence
steps / time - usually 90-120/min
define gait speed
rate of forward linear motion - distance/time
change of walking velocity over time
walking acceleration
step length
distance of step from R and L extremity
stride length
distance covered by same foot
1 stride length - 1 gait cycle
width of BOS
linear distance betw midpoint of heel and of other foot
normal: 5-10 cm
normal value of degree of toe out
7-8 deg
intersecting center of heel and 2nd toe
immature or mature gait
wider BOS
immature
immature or mature gait
adequate BOS
mature
immature or mature gait
UE high or medium guard
immature
immature or mature gait
UE produces reciprocal arm swing
mature
immature or mature gait
flat foot at contact and pronated foot in WB
immature
immature or mature gait
heel strike at contact and adequate arch in WB
mature
immature or mature gait
variable step length
immature
immature or mature gait
less variable step length
mature gait
immature or mature gait
hip FABER and excess knee flex at swing
immature
immature or mature gait
sufficient foot clearance at swing
mature
immature or mature gait
knee hyperex throughout stance
immtaure
immature or mature gait
knee in semi flex during midstance
mature
immature or mature gait
increased cadence
immature
immature or mature gait
normal cadence
mature
what are the determinants of gait
adjustments made by the body to keep COG displacement minimal
optimize COG and reduce energy consumption
discuss vertical displacement of COG
lowest - heel strike and double support
highest - during midstance
average lateral displacement of COG in gait
1.8-2 inches
average vertical displacement of COG in gait
1.8-3 inches during midstance
what are the six determinants of gait
pelvic rotation
pelvic tilt
knee flexion
knee mechanism/interactions
ankle and foot mechanism/interaction
lateral pelvic motion
discuss pelvic rotation in gait
pelvis rotates forward and backward in transverse plane to prevent excessive drop of COG
IR on stance of LE
ER on wing of LE
discuss lateral pelvic tilt in gait
downward pelvic tilt on swing leg at z-axis during midswing to prevent excessive rise of COG
adduction on stance
discuss knee flexion in gait
initial contact - knee is extended
midstance - flexed at 15-20 deg; highest COG so mag flex to prevent COG rising and also for shock absorption and better energy use
discuss knee, ankle and foot mechanisms/interaction in gait during heel strike
heel strike - knee extended - ankle neutral = lengthening oof leg that reduces drop of COG
discuss knee, ankle and foot mechanisms/interaction in gait during toe off
toe off - ankle pflex - lenghtening of LE - reduces drop of COG
discuss knee, ankle and foot mechanisms/interaction in gait
if leg lengthens - ankle will adapt kaya neutral
if leg shortens - ankle will pflex to stop shortening
discuss lateral pelvic motion in gait
results to physiologic valgus of knee = reduces BOS
adduction on stance LE prevents excessive side-to-side movement of COG
describe the stance phase in stair gait
when you start to give BW to leading extremity
pull up body and forward continuance
64%
describe the stair phase in stair gait
as foot clearance occurs and when foot placement occurs
36%