In orthopedic medicine, the Sanders classification is a system of categorizing intra-articular calcaneal fractures based on the number of articular fragments seen on the coronal CT image at the widest point of the posterior facet.
| Type | Description | |
|---|---|---|
| I | Nondisplaced posterior facet | |
| II | Displaced with one fracture line in the posterior facet | |
| III | Displaced with two fracture lines in the posterior facet | |
| IV | Comminuted with more than three fracture lines in the posterior facet |