| Classification | Description | Notes |
| Stage 1 | Scapholunate failure | |
| Stage 2 | Capitolunate failure | |
| Stage 3 | Triquetrolunate failure | |
| Stage 4 | Dorsal radiocarpal ligament failure | Allows lunate dislocation |
References:
Mayfield JK. Mechanism of carpal injuries. Clin Orthop Relat Res. 1980(149):45-54.