Innominates

Question 1

What is the primary function of the piriformis when the hip is extended?

Answer 1

External rotator

Question 2

What is the primary function of the piriformis when the hip is flexed?

Answer 2

Abductor

Question 3

What is the only rotator that connects directly to the sacrum?

Answer 3

Piriformis

Question 4

What is the composition of the sacral surface?

Answer 4

Thick hyaline cartilage

Question 5

What is the composition of the ilial surface?

Answer 5

Thin fibrocartilage

Question 6

What is an instantaneous axis?

Answer 6

Temporary axis created via the gait cycle as bones glide along the joint

Question 7

What is the location of the average of axes in the sagittal plane, in regard to the SI joint, called?

Answer 7

Bonnaire’s Tubercle

Question 8

What two ligaments stabilize anterior movement along the lower lumbar spine?

Answer 8

1) Upper part of the sacroiliac ligament

2) Iliolumbar Ligament

Question 9

What is the significance of the Sacrotuberus ligament?

Answer 9

It connects the sacrum to the ischial tuberosity
2) Also, serves as an attachment for the gluteus maximus.
Overall, serves as an attachment between the LE, Sacrum and Ischium

Question 10

What is the significance of the sacrotuberus and sacrospinous ligament, in regards to ROM?

Answer 10

They prevent the posterior and superior rotation of the sacral apex along a transverse axis

Question 11

What is the attachment of the spinal cord at the caudal end?

Answer 11

Sacrum level of S2