Subluxation Practice Test

Which of the following is a possible atlas listing on a lateral cervical view?

AS or AI AS or PS AI or PI PS or AI

Correct Answer:

AI or PI

Explanation:

In a lateral cervical radiograph, atlas listings describe two aspects of position: whether the atlas sits anterior or posterior to the skull base, and whether that position is above or below a reference line. anatomically, the atlas sits below the skull, so a superior (above) relation isn’t possible on this view. That means the only valid vertical component is inferior, leaving two possible combinations: anterior inferior or posterior inferior. Since the lateral view lets you see forward or backward shift (anterior vs posterior) and the atlas must be inferior, the two workable listings are anterior inferior and posterior inferior. The other pairings would require a superior relation, which doesn’t occur in this view. So the correct option reflects AI or PI.

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