Which descriptor completes the four-part description of a spondylolisthesis: Level, Direction, Degree, and What?

• A. Etiology
• B. Location
• C. Cause
• D. Due To

Answer: (D)

In describing a spondylolisthesis, you specify four things: level (which vertebra is involved), direction (slip direction, usually anterior), degree (how much slip there is), and what the slip is due to. The missing descriptor is the cause of the slip—the etiology behind the condition. Saying it is “due to” something directly names that cause, which is exactly what the question is asking for. Among the options, “Due To” clearly communicates the causal link the four-part description requires. While the formal term for cause is etiology, the prompt’s phrasing targets the idea of the slip being “due to” a cause, making it the most fitting choice in this context.