Question 1

What and where are the sacroiliac joints (SI joints)?

Accepted Answer

The sacroiliac joint, often abbreviated as SI joint, is the joint formed where the boomerang shaped sides of the sacrum meet the similarly shaped parts of the ilium on the back (dorsal side) of the pelvis. We have two SI joints, one on each side of the pelvis where the ilium and sacrum come together. The SI joints are where the two sides of the pelvis connect to the spine.

Question 2

Do the sacroiliac joints (SI joints) move?

Accepted Answer

Movement at the SI joints is called nutation and counter-nutation. Nutation occurs when the top of the sacrum moves down and forward (anterior and inferior) in relationship to the two sides of the pelvis. Counter-nutation happens when the top of the sacrum moves back and down (posterior and inferior).

Question 3

How do the sacroiliac joints (SI joints) move during backbending in yoga?

Accepted Answer

No one knows the answer to this question for sure. No researchers have studied the movement of the sacroiliac joints (SI joints) during yoga-type backbending postures.

Yoga Anatomy Articles

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A Reality Check On The SI Joint In Yoga

Sacroiliac Movement – Nutation And Counternutation