Evaluating cranial landmarks for yaw orientation in natural head position: a 3D study

Area of Science:

• Craniofacial anatomy
• Anthropometry
• Biomedical imaging

Background:

• Accurate head positioning is crucial in various medical and research applications.
• The natural head position (NHP) is a standard reference, but its precise orientation relies on reliable cranial landmarks.
• Previous studies have not fully assessed the bilateral symmetry of specific anthropometric points used for yaw orientation.

Purpose of the Study:

• To evaluate the symmetry of eight cranial anthropometric points relative to the mid-sagittal plane.
• To determine the reliability of these points for establishing yaw orientation in the natural head position (NHP).

Main Methods:

• Prospective analysis of tomography data from 55 patients.
• Radiopaque markers were used to record head position in the NHP.
• Symmetry of eight specific cranial points was measured against the mid-sagittal plane using digital analysis.

Main Results:

• Significant asymmetry was detected in the stephanion, frontozygomatic suture, and ectoconchion points (p < 0.05).
• No statistically significant asymmetry was found for zygomaxillare, zygion, porion, mastoidale, and condylion laterale.
• These findings highlight variability in specific cranial landmarks.

Conclusions:

• The stephanion, frontozygomatic suture, and ectoconchion are unreliable landmarks for yaw orientation in the NHP.
• Alternative or combined landmarks, alongside clinical assessments, may provide more dependable yaw orientation.
• Further research into reliable cranial landmarks for head positioning is warranted.