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Related Experiment Video

Updated: Jul 3, 2026

Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model

Midface Hypoplasia and Cranial Base Morphology in Syndromic Craniosynostosis: A Comparative Analysis Study Using a Predictive Regression Model

Published on: November 4, 2025

Craniofacial reference plane variation and natural head position.

David P Madsen¹, Wayne J Sampson, Grant C Townsend

¹School of Dentistry, The University of Adelaide, Australia.

European Journal of Orthodontics

|July 18, 2008

Summary

This summary is machine-generated.

The Krogman-Walker (KW) line and palatal plane show potential as craniofacial reference planes, offering alternatives to traditional methods like Frankfort Horizontal (FH) when natural head position (NHP) is unreliable. However, NHP remains the most valid reference system.

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Area of Science:

Orthodontics and Craniofacial Imaging
Cephalometric Analysis
Biometric Reference Systems

Background:

Traditional craniofacial reference planes, such as Frankfort Horizontal (FH) and sella-nasion, exhibit variable orientation relative to true horizontal (HOR).
This variability complicates accurate cephalometric analysis and comparisons across individuals.

Purpose of the Study:

To evaluate the utility of various craniofacial reference planes, including novel ones like the Krogman-Walker (KW) line, in relation to true horizontal (HOR).
To assess the reproducibility of the natural head position (NHP) as a reference system.

Main Methods:

Photographic and cephalometric analysis of 57 pre-treatment orthodontic subjects (aged 12-18 years) in a guided natural head position (NHP).
Orientation of cephalograms to a true vertical line derived from photographs.
Statistical analysis of the orientation and variability of 11 craniofacial reference planes relative to HOR and NHP reproducibility.

Main Results:

Most investigated craniofacial reference planes showed high variability relative to HOR.
The Frankfort Horizontal (FH) and Krogman-Walker (KW) lines exhibited the lowest variability to HOR (SDs of 4.6 and 4.7 degrees, respectively).
The KW line and palatal plane were closest to HOR, but NHP demonstrated superior reproducibility and validity compared to the evaluated reference planes.

Conclusions:

The Krogman-Walker (KW) line and palatal plane may serve as viable alternatives to conventional reference planes when a reliable NHP cannot be established.
Natural head position (NHP) remains the most accurate and reproducible craniofacial reference system for cephalometric analysis.