Type | Description | Characteristics |
I | Normal web | Thumb web space not narrowed |
IIA | Mildly narrowed web | Thumb web space mildly narrowed |
IIB | Severely narrowed web | Thumb web space severely narrowed |
III | Syndactylized web | Thumb and index rays syndactylized, web space obliterated |
IV | Merged web | Index ray suppressed, thumb web space is merged with the cleft |
V | Absent web | Thumb elements suppressed, ulnar rays remain, thumb web space no longer present |