Savarese Ch 6: Sacrum & Innominates

Question 1

Which are the primary pelvic muscles?

Answer 1

The ones that make up the pelvic diaphragm:

Levator ani; Coccygeus muscles

Question 2

What is the origin/insertion of the piriformis:

Answer 2

O: at the inferior anterior aspect of the sacrum
I: the greater trochanter of the femur

Question 3

Piriformis action

Answer 3

Externally rotates, extends thigh and abducts thigh with hip flexed

Question 4

Innervation of the Piriforms

Answer 4

S1 and S2 nerve roots

Question 5

Clinical significance of the piriformis

Answer 5

The sciatic nerves runs through the it.

Spasm will cause pain that radiates down the thigh, but NOT below the knee.

Question 6

Which axis do the innominates rotate on?

Answer 6

they rotate about an inferior transverse axis of the sacrum

Question 7

Postural motion occurs around which axis?

Answer 7

Middle transverse axis of the sacrum

Question 8

Dynamic motion (ambulation) occurs about which sacral axis?

Answer 8

Oblique

Step forward with the right foot engages the left oblique axis

Question 9

What should be treated first? L5 or the sacrum?

Answer 9

L5

Question 10

If you have a left psoas syndrome, what happens to the lumbar?

Answer 10

L1 and L2 will be flexed, SB and R to the SAME side as the iliopsoas contracture