The LOD is P-A, S-I only. What listing does this indicate?

• A. PI
• B. IN
• C. EX
• D. AS

Answer: (D)

This item tests how line-of-drive directions map to a vertebral listing. In full-spine practice, the LOD describes the direction the vertebra is displaced in relation to the one below, using two axes. A drive from back toward front indicates an anterior component, while a drive from top toward bottom indicates a superior component. When you translate those directional cues into the standard two-letter listing, you pair anterior with superior to reflect the displacement quadrant. That yields an anterior-superior listing.

So, the combination of P-A and S-I directions points to an anterior-superior listing. If the motion were toward posterior or toward inferior, different two-letter listings would apply.