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Related Experiment Video

Updated: Feb 4, 2026

Creation of a Knee Joint-on-a-Chip for Modeling Joint Diseases and Testing Drugs

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The Cricothyroid Joint: A Practical Guide for Distinguishing Between Different Joint Types.

Jasmin Koch¹, Fabian Unteregger¹, Flurin Honegger¹

¹University of Basel, University Hospital, Department of Otorhinolaryngology, Head and Neck Surgery, Division of Phoniatrics, Switzerland.

Journal of Voice : Official Journal of the Voice Foundation

|September 25, 2018

Summary

High-resolution CT scans can differentiate cricothyroid joint (CTJ) types, crucial for vocal fold elongation and pitch elevation in transwomen. Type A CTJs have an intercartilaginous space under 1 mm, while Type B/C CTJs exceed 1 mm.

Keywords:

3D Cricoid-thyroid approximation Cricothyroid Joint Larynx MIMICS

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Area of Science:

Anatomy
Radiology
Laryngology

Background:

The cricothyroid joint (CTJ) type influences vocal fold elongation.
Accurate CTJ typing is essential for surgical interventions like cricothyroid approximation for pitch elevation in transwomen.
Distinguishing between Type A (cricoid cartilage protuberance) and Type B/C (flat cricoid) CTJs is clinically significant.

Purpose of the Study:

To develop a tool for distinguishing between Type A and Type B/C CTJs using high-resolution computed tomography (HRCT).
To aid clinicians and radiologists in identifying CTJ types for surgical planning.

Main Methods:

Prospective study analyzing 120 laryngeal HRCT scans (60 male, 60 female).
Three-dimensional reconstructions of laryngeal cartilages and CTJs were performed.
Intercartilaginous distances were measured to differentiate CTJ types.

Main Results:

Three-dimensional CTJ reconstructions were feasible in all scans.
Type A CTJs exhibited a characteristic cricoid cartilage protuberance.
Type B/C CTJs displayed a flat cricoid joint cartilage.
Type A was found in 61% and Type B/C in 39% of both male and female larynges.
Intercartilaginous distances were <1 mm for Type A and >1 mm for Type B/C CTJs.

Conclusions:

HRCT can reliably differentiate Type A and Type B/C CTJs based on intercartilaginous distance.
Type A CTJs are associated with intercartilaginous spaces <1 mm.
Type B/C CTJs are associated with intercartilaginous spaces >1 mm.