9.5 hip, pelvis, sij musculature
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what nerves come off the lumbar plexus? T12-L4
femoral, obturator nerves, saphenous
what nerves come off the sacral plexus? L4-S4
sciatic nerve, tibial portion, common fibular portion
what are the primary hip flexors?
illioposas, sartorius, TFL, rectus femoris, adductor longus, pectineus
what are the secondary hip flexor muscles?
adductor brevis, gracilis, gluteus minimus (anterior portion)
the insertion of the illioposas is deflected..?
posteriorly about 35-40 degrees over anterior brim of the pelvis
what motion raises the angle of insertion to get improved leverage of the illioposas? what motion increases the moment arm?
extension , flexion to 90 degrees
why does hip flexion to 90 degrees increase the moment arm of illiopoas?
the lesser trochanter swings out and away from the hip joint anteriorly
people can get internal snapping hip syndrome from what?
distal illiopsoas can become abraded, the muscles that go over illiopubic eminence , hip capsule, head of femur, anterior brim of pelvis cause friction
what is the muscle synergy required for supine unilateral straight leg raise? what is the rectus abdomis doing?
activation of abdominal muscles and hip flexors, holding pelvis in a neutral rotation preventing anterior tilt of the pelvis
if there isnt rectus abdomins activation in unilateral straight leg raise what do the illiopoas tend to do?
anteriorly tilt pelvis instead of normal hip flexion
what does sartorius do?
flexion, ER, abduction
what does the TFL do?
flexor, abductor, IR from a position of ER
what will we see if patients have weak glute meds relative to the TFL?
tfl is used they will deviate into hip flexion during hip abduction exercises
what muscle is an important stabilizer of anterior capsule and 1/3 of isometric hip flexion torque?
rectus femoris
when is rectus femoris in active insufficiency?
knee extension and hip flexion
when is rectus femoris in passive insufficiency?
knee flexion and hip extension
what are the primary hip adductors?
pectineus, adductor longus, gracilis, adductor brevis and magnus
what are the secondary hip adductors?
biceps femoris (long head), gluteus maximus (inf/post), quadratus femoris, obturator externus
what planes do the adductor muscles produce torques in?
all 3
what plane are hip adductors capable of femoral-on-pelvic and pelvic-on-femoral ?
frontal plane
when kicking a ball with your right foot what is happening on the right and left sides?
right is femoral on pelvic adduction and left is pelvic on femoral hip adduction
what muscle do you need on the support side when kicking a ball to be working eccentrically to lower the opposite side?
glute medius
in the saggital plane most adductor fibers pass through the medial lateral axis at what motion?
40-70 degrees of hip flexion
above 70 degrees of flexion what do adductors become?
extensors