| Avulsion type | Description |
|---|---|
| Type 1 | Simple avulsion with bone fragment of variable size. |
| Type 2 | Beak fracture with a horizontal fracture which reaches the posterior body |
| Type 3 | Infrabursal avulsion by the superficial fibers quota of the half third of the Achilles tendon |
| Type 4 | Tiny beak fracture avulsed from the deep fibers quota of the tendon |