Hyolaryngeal Kinematics in Primary Muscle Tension Dysphonia Determined by Ultrasound.
Anya Freedman-Doan, Lisandra Pereyra Maldonado, Soren Y Lowell
PMID 39232880WHAT IT FOUND
Ultrasound showed greater hyoid and thyroid movement during voicing in primary muscle tension dysphonia than in healthy speakers, especially thyroid toward hyoid.
Thyroid movement tracked speaking effort and voice handicap.
Key findings
01During voicing, adults with pMTD showed greater hyoid-to-mandible approximation and greater thyroid-to-hyoid approximation than healthy speakers.
02Thyroid-to-hyoid displacement showed significant associations with speaking effort and voice handicap.
03Ultrasound measurement of these displacements had good to excellent reliability across raters and repeated trials.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study compared only 26 adults, so group differences may not generalize. It was a single assessment and did not test whether ultrasound changes diagnosis, guides therapy, or improves voice outcomes. The pMTD group required acoustic dysphonia and other strict criteria, so people with voice fatigue or symptoms without measurable dysphonia may not be represented. Ultrasound measured relative distance between structures, so some movement can be hard to attribute to hyoid elevation, mandible lowering, or thyroid elevation without additional imaging. pMTD data were drawn from an ongoing larger randomized trial, so the sample may reflect trial-specific recruitment.
The easy way to misread this
Do not conclude that ultrasound can diagnose pMTD or that treatment should be chosen from these results. The study compared 13 people with pMTD and 13 healthy speakers in a single assessment and did not test whether ultrasound changes diagnosis, treatment, or voice outcomes.