| Type | Description |
| Type I | An interarytenoid scar band between the vocal folds that is anterior and separate from the posterior interarytenoid mucosa. |
| Type II | Scarring of the mucosa or musculature of the posterior interarytenoid area (limited motion of arytenoids) |
| Type III | Unilateral cricoarytenoid joint fixation |
| Type IV | Bilateral cricoarytenoid joint fixation |
Contributed by Emily Zhang