L9 SIJ/Pelvis

Question 1

innominates

Answer 1

ilium, ischium, and pubis

Question 2

nutation

Answer 2

locking SIJ
anterior movement of sacrum relative to the inominate’s posterior movement

Question 3

which ligament checks nutation?

Answer 3

sacrotuberous ligament

Question 4

counter nutation

Answer 4

unlocking SIJ
posterior sacral movement relative to inominate anterior movement

Question 5

which ligament checks counter nutation movement?

Answer 5

posterior SI ligament

Question 6

if SIJ can’t lock/nutate, will closed or open chain be more difficult?

Answer 6

closed

Question 7

if SIJ can’t unlock/counter nutate, will closed or open chain be more difficult?

Answer 7

open chain

Question 8

two anatomical structures of SIJ giving it stability

Answer 8

form closure: irregular wedge shape and ligamentous stability
ridges and grooves of bony surfaces
force closure: timing of pelvic muscles to generate support and movement of SIJ

Question 9

are anterior or posterior SI ligaments stronger

Answer 9

posterior are thicker and stronger

Question 10

muscles pulling posteriorly on SIJ

Answer 10

lats, erector spinae, QL, glut mac, HS, multifidi

Question 11

muscles pulling anterioly on SIJ

Answer 11

abs, obliques, iliopsoas, RFTFL, sartorius

Question 12

muscles pulling SIJ laterally

Answer 12

glut med, QL, glut min, piriformis

Question 13

muscles pulling SIJ medially

Answer 13

hip IR from pectineus, adductors

Question 14

muscles generating force closure on SIJ

Answer 14

glut max, biceps femoris, erector spinae, lats

Question 15

planar motions at pelvic girdle

Answer 15

ilial motion: rotation, inflare, outflar, upslip, downslip
sacral motion: nutation/counternutation, rotation
pubic motion: upslip

Question 16

function of the SIJ

Answer 16

shock absorption system between lumbar and LE
self bracing

Question 17

amount of movement at SIJ

Answer 17

3 degrees or less rotation
2mm or less of translation

Question 18

pelvic tilt of L vs R

Answer 18

both ASIS and PSIS will be higher or lower than the other side
can result from leg length discrepancies or one side of the pelvis being under developed

Question 19

pelvic torsion

Answer 19

PSIS lower on L vs R
ASIS higher on L vs R
aka rotation

Question 20

sign of the buttock

Answer 20

deep gluteal pain with no MSK cause:
large and swollen buttock without trauma
SLR limited and painful
hip flexion with knee flexion limited and painful
limited trunk flexion
non capsular movement restriction
resisted hip movements painful and weak

Question 21

fortins finger

Answer 21

pointing to pain with fingers 3 cm wide and 10 cm long below PSIS

Question 22

load transfer tests

Answer 22

active forward bending
functional squat
UL standing
active SLR
compare painful side to non painful side