Determining the Relationship Between Hyoid Bone Kinematics and Airway Protection in Swallowing.
Sana Smaoui, Melanie Peladeau-Pigeon, Catriona M Steele
PMID 34982956WHAT IT FOUND
Hyoid bone movement alone does not predict aspiration risk once laryngeal closure is accounted for.
Clinicians should prioritize whether the larynx closes completely and how quickly it does so, rather than relying on hyoid excursion measures to judge swallowing safety.
Key findings
01Incomplete laryngeal closure and prolonged time to closure were the only significant predictors of penetration-aspiration in the full dataset.
02Adding hyoid kinematics to the model did not improve the prediction of swallowing safety.
03Laryngeal closure duration is only a valid predictor when closure is complete.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The analysis was conducted at the bolus level rather than the participant level, ignoring the fact that patients do not aspirate consistently on every swallow. The study only analyzed thin liquids, so findings may not apply to thicker consistencies where timing dynamics differ. The sample consisted of adults at risk for dysphagia, so the results do not represent healthy swallowing mechanics. Reference values for hyoid position and closure timing were based on adults under 60, which may not perfectly align with the older participants in the study.
Declared interests
The original data collection was funded by Nestlé Health Science. The current analysis was funded by a National Institute on Deafness and Other Communication Disorders grant.
The easy way to misread this
Do not dismiss hyoid kinematics as irrelevant to swallowing physiology. The study found that reduced hyoid movement is significantly associated with impaired laryngeal closure, meaning it remains a useful indicator of the underlying mechanism causing the risk, even if it does not independently predict the aspiration event.