Chiropractic Full Spine Practice Test

Which statement is true about leg-length effects of PI and AS subluxations?

PI shortens; AS lengthens PI lengthens; AS shortens PI shortens; AS shortens PI lengthens; AS lengthens

Correct Answer:

PI shortens; AS lengthens

Explanation:

Innominate positions change how the pelvis sits under the spine, which in turn affects the apparent length of the leg. When the ilium is posteriorly rotated (PI), the pelvis tilts in a way that makes the limb on that side measure shorter. When the ilium is anteriorly rotated (AS), the pelvis tilts the opposite way, making the limb on that side appear longer. So the true statement is that PI shortens and AS lengthens. Remember, this is an apparent, functional discrepancy caused by pelvic tilt, not a true bone shortening or lengthening.

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