If edema is felt in the superior portion of the SI joint, what listing is suggested?

• A. PI
• B. AS
• C. EX
• D. IN

Answer: (A)

Edema location on the sacroiliac joint helps indicate which innominate position is stressed. If you feel edema in the superior portion of the SI joint, it points to a posterior-inferior innominate listing. That means the ilium is rotated backward (posterior) and tilted downward (inferior) relative to the sacrum, causing the superior part of the joint to be irritated and swollen.

Understanding this pattern helps distinguish it from other listings. An anterior-superior listing would involve the opposite orientation of the ilium and would tend to produce different edema patterns or joint stress signs, while external or internal rotation listings reflect other directional changes that don’t match the superior-joint edema you’re palpating. So the superior SI edema best fits the posterior-inferior innominate listing.