Which of the following is NOT used to determine the S3 level on the lateral image?

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Multiple Choice

Which of the following is NOT used to determine the S3 level on the lateral image?

On a lateral pelvic radiograph, you locate sacral levels by using posterior landmarks that line up with the sacrum. The shadow of the greater sciatic notch, the sacral promontory, and the tip of the sacrum provide consistent references for identifying where S3 lies along the vertical axis. The pubic symphysis sits anterior to the sacrum and does not align with the sacral vertebrae on this view, so it isn’t a reliable marker for determining the S3 level.

On a lateral pelvic radiograph, you locate sacral levels by using posterior landmarks that line up with the sacrum. The shadow of the greater sciatic notch, the sacral promontory, and the tip of the sacrum provide consistent references for identifying where S3 lies along the vertical axis. The pubic symphysis sits anterior to the sacrum and does not align with the sacral vertebrae on this view, so it isn’t a reliable marker for determining the S3 level.

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