Cricothyroid Joint

articulatio cricothyroidea

The cricothyroid joint is a bilateral synovial articulation between the inferior cornua of the thyroid cartilage and the lateral facets of the cricoid cartilage. It allows the thyroid cartilage to rock anteriorly and inferiorly relative to the cricoid, a movement controlled by the cricothyroid muscle that lengthens and tenses the vocal folds, raising vocal pitch.

Region: Neck

Clinical Relevance

Clinical Notes

The cricothyroid joint is the mechanism through which the external branch of the superior laryngeal nerve modulates vocal pitch by controlling cricothyroid muscle contraction and joint motion. Loss of nerve supply or joint fixation from trauma or arthritis reduces pitch range and projection. Cricothyroid joint assessment is part of the laryngeal examination in professional voice users. Surgical access to the cricothyroid membrane for emergency cricothyrotomy is performed immediately anterior to this joint.

Pathology

Common Injuries & Conditions

Cricothyroid Joint Fixation

Post-traumatic or inflammatory ankylosis limits the thyroid-cricoid rocking movement, reducing the vocal range and pitch flexibility, particularly affecting professional singers who require a wide pitch range.