Biomechanical Mechanisms of Vocal Fold Nodule and Polyp Formation: A Review.
Andrew R Li, Michael Kuang, Jakob R Holm and 2 others
PMID 42629265WHAT IT FOUND
Nodules and polyps are different loading problems.
Nodules come from repeated symmetric stress and often respond to voice therapy. Polyps come from acute stress that ruptures capillaries and may need surgery. Assess hydration and unilateral asymmetry.
Key findings
01The review distinguishes nodules as cumulative symmetric repetitive loading and polyps as acute high-magnitude stress transients that breach a vascular rupture threshold.
02Nodules often respond to behavioral voice therapy alone, while established polyps typically require phonomicrosurgical excision when persistent dysphonia justifies it.
03The review cites laryngeal electromyographic evidence of paresis in 48.6% of patients diagnosed with vocal polyps and advises evaluating unexplained unilateral lesions for an occult neurogenic component.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
This is a narrative review, not a study of patients or a treatment trial. The proposed stress thresholds are derived from heterogeneous cadaveric, model, and clinical sources and are described by the authors as hypothesis-generating rather than in vivo predictions. Direct in vivo measurement of vocal fold tissue strain during phonation remains technically infeasible, so the mechanism is inferred from indirect measures. Sex and age differences in vocal fold mechanical properties are not addressed in detail and may modify the thresholds. The vibratory asymmetry evidence has a smaller experimental base than the nonlinear loading and collision sections. Because the review does not test interventions, it cannot establish that hydration counseling, voice therapy, or surgery produces outcomes.
Declared interests
The authors declare no conflicts of interest.
The easy way to misread this
Do not read the biomechanical thresholds as proven in vivo predictions. The authors state they are hypothesis-generating and based on heterogeneous experimental conditions.