hip musculature Flashcards
anterior muscles
iliopsoas
rectus femoris
sartorius
iliopsoas
most important primary hip flexor
postural muscle
when is ilopsoas active
supine to sit
legs are fixed
sit-up
rectus femoris
2 joint muscle
will flex the hip and extend the knee
is the rectius femoris more efficient at the knee or hip
as a knee extensor
most efficient position at hip (RF)
when knee is flexed
rectus femoris –> hip is free to move and knee is stable
hip flexion will occur
rectus femoris –> hip and knee are both free to move
hip flexion and knee extension
rectus femoris –> knee is free to move but hip is stable
knee extension
rectus femoris –> both are stable
anterior pelvic tilt
rectus femoris –> active insufficiency
too short –> hip flexion and knee extension
too long –> hip extension and knee flexion
rectus femoris –> passive insuff
hip extension and knee flexion
sartorius
2 joint muscle
will flex the hip and knee
ER and ABD the hip
IR the tibia
where is the sartorius strongest
at the hip
posterior muscles
glute max
hamstrings
piriformis
quadratus femoris
obturator internus
obturator externus
superior and inferior gemillus
glute max
one joint muscle
primary hip extensor
will ER the hip
when does the glute max work
when resistance is greater than the weight of the limb
the more the hip is flexed
less the glute max is used
closed kinetic chain –> glute max
ER will result in contralateral trunk rotation
hamstrings
2 joint muscle
extend the hip and flex the knee
where are the hamstrings stronger
the hip
lateral hammys
biceps femoris
extends and ER the hip
flexes and ER the tib
medial hammys
semimembranosis and semitendinosis
extend and IR the hip
flex and IR the tib
hamstrings are the
PRIMARY HIP EXTENSORS
hamstring greatest moment arm
hip flexed at approx 35 degrees
when are the hammys active
all movements that require hip extension
hammys –> both knee and hip are free to move
hip ext
knee flexion
hammys –> both hip and knee are stable
posterior pelvic tilt
hammys –> hip is stable and knee is free
knee flexion
hammys –> hip is free and knee is stable
hip extension
hammys –> active insuff
too short –> hip extension and knee flexion
too long –> hip flexion and knee extension
hammys –>passive insuff
hip flexion and knee extension
piriformis
one joint muscle
action is dependent on hip position
piriformis –> hip in ext and up to 90 degrees of flexion
ER hip
piriformis –> over 90 degrees of flexion
IR hip
what can the piriformis assist with
hip ABD
where does the sciatic never enter
enters gluteal region just inferior to the piriformis muscle
quadratus femoris
hip ER
obturator internus
hip extended –> ER
hip flexed 30 or more –> IR
assist with hip ABD
stabilize the hip
obturator externus
hip ER
assist with hip ABD
stabilize the hip
superior and inferior gemillus
hip ER
assist with hip ABD
stabilize the hip
medial muscles
primary function is hip ADD
adductor longus
adductor magnus
adductor brevis
gracilis
work horse of the adductors
adductor longus
IR the hip too
flexor –> hip flexed up to 70
extensor –> hip flexed over 70
when is adductor magnus active
when resistance is added to ADD
will also IR the hip
flexor –> hip is extended or flexed to 50
extensor –> hip flexed over 50
lateral muscles
glute med
glute min
TFL
glute med
largest of the lateral hip muscles
anterior, posterior and middle fibers can work independently
all fibers active for ABD
glute med –> anterior fibers
flexion and IR
glute med –> posterior fibers
hip ext and ER
what does the glute med do during single leg stance
maintain a level pelvis
