From which edge is the horizontal line X drawn on the lateral standing pelvis X-ray?

From which edge is the horizontal line X drawn on the lateral standing pelvis X-ray?

• A. Anterior edge of pubic bone
• B. Posterior edge of pubic bone
• C. Superior edge of pubic bone
• D. Inferior edge of pubic bone

Answer: (A)

A horizontal reference line on a lateral standing pelvis radiograph is drawn from the anterior edge of the pubic bone because that border provides the most consistent, easily identifiable landmark in this projection. The anterior cortex of the pubic bone appears as a clear, straight edge that remains visible despite pelvic rotation or overlying structures, making it reliable for establishing a true horizontal baseline. Using this edge allows you to assess pelvic tilt and alignment by comparing other pelvic landmarks to that fixed, horizontal line. The posterior, superior, or inferior edges are less reliable in this view due to superimposition, variability in visibility, or overlap, which can distort a true horizontal reference.

A horizontal reference line on a lateral standing pelvis radiograph is drawn from the anterior edge of the pubic bone because that border provides the most consistent, easily identifiable landmark in this projection. The anterior cortex of the pubic bone appears as a clear, straight edge that remains visible despite pelvic rotation or overlying structures, making it reliable for establishing a true horizontal baseline. Using this edge allows you to assess pelvic tilt and alignment by comparing other pelvic landmarks to that fixed, horizontal line. The posterior, superior, or inferior edges are less reliable in this view due to superimposition, variability in visibility, or overlap, which can distort a true horizontal reference.