Edema at the superior portion of the SI joint corresponds to which listing?

• A. PI
• B. AS
• C. EX
• D. IN

Answer: (A)

Edema patterns help map the direction of the innominate’s misalignment at the sacroiliac joint. When the ilium is rotated posteriorly with an inferior tilt, the superior portion of the SI joint tends to accumulate stress and fluid, producing edema in that region. This edema distribution aligns with the PI listing, which describes a posterior (and often inferior) orientation of the innominate relative to the sacrum. The other listings describe different directional alignments (anterior-superior, external rotation, internal rotation), which would show edema or diagnostic clues in different regions or patterns not matching the superior SI joint edema pattern. So edema at the superior SI joint corresponds to the PI listing.