hip muscle fxn Flashcards
muscles at the hip will
fxn to maintain balance and equilibrium
sagittal plane
control of flexion and extension
where does the LOG fall in the sagittal plane
posterior to the hip joint
creates an extension moment at the hip
counteracted by flexors
what happens when the LOG falls anterior to the joint axis
flexion moment is created
counteracted by the extensors
transverse plane
gait
constant interplay b/w the IRs and ERs
trunk and pelvis rotate ….
opposite of each other
frontal plane
control of ABD and ADD
double leg stance
body will experience a shift from side to side
controlled eccentrically by the ABDs and ADDs
shifting from right to left –>double leg stance
relative left hip ADD
relative right hip ABD
to control shifting from right to left –>double leg stance
eccentric contraction of the left ABDs and right ADDs
to return back to neutral, shifting from right to left –>double leg stance
concentric contraction of left ABDs and right ADDs
single leg stance
full body weight is supported by the opposite hip joint
approximately 5/6 of BW
gravity will create an ADD torque around the supporting hip
to maintain a level pelvis –> SLS
hip ABDs on the stance leg must counteract the ADD torque
what is extremely important for functional activities
ability of ABDs to produce torque
paralysis of hip ABDs
results in hip drop
trensdelenberg gait
trendelenberg
uncompensated
compensated
uncompensated trensdelenberg
hip drop –> happens on the good side
hip hike on the weaker side
compensated trensdelenberg
trunk lean towards the weaker side
–> shortens the moment arm and puts less compression on the joint
how is trendelensberg named
for the side of the weakness
solutions for trendelenberg
decreased BW
cane on contralateral side
strengthen the hip ABDs
bonus –> glute med as a frontal plane stabalizer
during single leg stance the glute med will contract and give relative ABD force to counteract the ADD torque and maintain a level pelvis
