Which listing raises femur head on x-ray after correction?

• A. PI
• B. IN
• C. AS
• D. ASIN

Answer: (A)

The key idea is how pelvic/innominate position shows up on a pelvic X-ray and how correcting that position changes the femur head height. When the innominate is in a posterior-inferior (PI) rotation, the ilium sits lower and the femoral head on that side tends to appear lower on the X-ray. Correcting a PI listing brings the ilium up toward neutral, which tends to raise the femoral head on the radiograph. So this listing is the one whose correction would be observed as a rise in the femur head.

The other listings involve different directions of tilt or rotation that don’t consistently produce the same upward shift in the femur head after correction.