SI Joint

Question 1

Functions of SI joint

Answer 1

transfer load from trunk to legs (standing, walking)
absorbs LE motions/forces

Question 2

The lumbopelvic region consists of?

Answer 2

Lumbosacral junction
SI joints
Pubic symphysis
Hip joints
Coccyx

Question 3

What makes up the osseous ring?

Answer 3

Ilium
Sacrum
Pubis

Question 4

Which lumbar segments make up the lumbosacral junction?

Answer 4

L4,5 and S1

Question 5

What is the orientation of L5 and S1 facets?

Answer 5

Frontal

Question 6

What are the L5 and S1 facets made up of?

Answer 6

Dense cartilage
For weight bearing

Question 7

How is the iliolumbar ligament attached?

Answer 7

From L4/5 transverse process to iliac crest
Connected to QL muscle

Question 8

What is the function of the iliolumbar ligament?

Answer 8

Restricts all planes of movement

Question 9

Which ligament can be the source of unilateral pain in lumbosacral junction?

Answer 9

Iliolumbar ligament

Question 10

Osteokinematics: Sacroiliac during LUMBAR motion - Nutation

Answer 10

Nutation (flex) = Anterior and Inferior

Question 11

Osteokinematics: Sacroiliac during LUMBAR motion - Counternutation

Answer 11

Counternutation (ext) = Posterior and Superior

Question 12

Osteokinematics: Sacroiliac during LUMBAR motion - Axial Rotation

Answer 12

Reciprocal motion of unilateral
Nutation and Counternutation

Question 13

Osteokinematics: Iliosacral during HIP motion - anterior rotation

Answer 13

ASIS Inferior, PSIS Superior

Question 14

Osteokinematics: Iliosacral during HIP motion - posterior rotation

Answer 14

ASIS Superior, PSIS Inferior

Question 15

Biomechanics: Trunk Flexion

Answer 15

Both innominate anteriorly rotate
Sacrum nutates and then counternutates

Question 16

Biomechanics: Trunk Extension

Answer 16

Both innominate posteriorly rotate
Sacrum nutate

Question 17

Biomechanics: Hip Flexion

Answer 17

Unilateral innominate posterior rotation
Sacrum nutates

Question 18

Biomechanics: Hip Extension

Answer 18

Unilateral innominate anterior rotation
Sacrum counternutates

Question 19

What ligament limits anterior gapping

Answer 19

Anterior (Ventral) sacroiliac ligament

Question 20

What ligament limits posterior gapping?

Answer 20

Interosseous ligament

Question 21

What ligament limits sacral counternutation (backward tilting)?

Answer 21

Posterior (long dorsal) sacroiliac ligament

Question 22

What ligament limits sacral nutation (forward tilting)?

Answer 22

Sacrotuberous ligament

Question 23

What ligament limits sacral nutation?

Answer 23

Sacrospinous ligament

Question 24

Attachments of Posterior (long dorsal) sacroiliac ligament?

Answer 24

PSIS to S3-4
Connects Thoracolumbar fascia and Erector Spinae

Question 25

Attachment of Sacrotuberous ligament?

Answer 25

PIIS to S3-4 to Ischial tuberosity
Connects to bicep femoris

Question 26

List the inner tube pelvic girdle muscles

Answer 26

TA
Multifidus
Diaphragm
Pelvic Floor

Question 27

List the outer tube pelvic girdle muscles and systems

Answer 27

Longitudinal (Erector spinae, TLF, bicep femoris, sacrotuberous lig)
Oblique (Anterior - Int/Ext Oblique, Abdom fascia, ADDuctors) (Posterior - lats, TLF, glut max)
Lateral (Glut med, min, ADDuctors)

Question 28

Ventral Rami innervates what segments?

Answer 28

L5-S2, branches from sacral plexus

Question 29

Dorsal rami innervates what segments?

Answer 29

L5, S1-4