Distractors
          The posterior and superior rotation of the sacral base relative to the ilium
The anterior and superior rotation of the sacral base relative to the lumbar spine
The posterior and inferior rotation of the sacral base relative to the lumbar spine
Key
              The anterior and inferior rotation of the sacral base relative to the ilium
Question
              In the article “Mastering the Sacroiliac Puzzle” by author Erik Dalton, nutation—in reference to the sacroiliac joint—means: