Sacroilliac Joint

Question 2

What is the function of the Sacrotuberous ligament?

Answer 2

It prevents anterior tilt of pelvis and upward displacement of sacrum

Question 3

Where is the Sacrotuberous ligament located?

Answer 3

It arises from the PSIS and the lower part of the sacrum of the coccyx and inserts into the ischial tuberosity

Question 4

What muscles attach to the sacrotuberous ligament?

Answer 4

Piriformis and gluteus maximus

Question 5

Where does the long dorsal ligament originate?

Answer 5

The PSIS and adjacent illum and inserts on S1 and S2

Question 6

What is the function of the long dorsal ligament?

Answer 6

Limits conuternutation

Question 7

What is nutation?

Answer 7

Movement of sacrum anteriorly and superiorly while coccyx moves Posteriorly in relation to illum

Question 8

What is counter nutation?

Answer 8

Opposite movement
Sacrum moves Posteriorly and inferiorly while coccyx moves anteriorly in relation to illum

Question 9

What is form closure?

Answer 9

Stable situation with closely fitting joint surfaces which no extra forces are needed to maintain the state of the system once it is under certain load

Question 10

What is force closure?

Answer 10

Local and global stabilizing muscle system of the pelvis,lumbar spine and legs

Question 11

What are muscles that produce force closure?

Answer 11

Glut max.
Internal oblique abdominal
Transverse abdominal