Craniofacial Analysis of Lateral Cephalograms in Obstructive Sleep Apnea-An Exploratory Case-Control Study

Area of Science:

• Medical Imaging
• Sleep Medicine
• Anatomy

Background:

• Obstructive sleep apnea (OSA) risk assessment using lateral cephalograms is debated.
• Previous studies lacked objective OSA exclusion and controlled for confounders.
• This study aimed to clarify the role of craniofacial characteristics in OSA.

Purpose of the Study:

• To evaluate differences in craniofacial characteristics between individuals with and without OSA.
• To determine if these characteristics independently predict OSA severity.
• To assess the utility of lateral cephalograms in OSA risk stratification.

Main Methods:

• Age-matched case-control study of 54 adults (27 OSA, 27 non-OSA).
• OSA defined by polysomnography (apnea-hypopnea index [AHI] ≥ 5).
• Lateral cephalograms analyzed for pharyngeal airway space (PAS), soft palate, and hyoid parameters; adjusted for BMI and skeletal pattern.

Main Results:

• No significant differences in craniofacial skeletal characteristics or PAS dimensions between groups.
• BMI was the strongest predictor of AHI.
• While hyoid position was more inferior/anterior in OSA, associations with AHI were attenuated after sex adjustment.

Conclusions:

• Static pharyngeal airway space measurements from lateral cephalograms lack clinical value for OSA screening.
• Hyoid position may offer complementary anatomical data but its independent predictive value for OSA remains uncertain.
• Further research is needed to clarify the role of specific anatomical features in OSA.