| Classification | Description | Notes |
| 1 | Nondisplaced | |
| 2A | 2 part, involves patellofemoral articular surface | Seen in osteoporotic patients |
| 2B | Comminuted, involves patellofemoral articular surface | Seen in osteoporotic patients |
| 3A | Medial condyle, extending into the intercondylar notch | Involves patellofemoral articular surface, but not the femorotibial articular surface |
| 3B | Lateral condyle, extending into the intercondylar notch | Involves patellofemoral articular surface, but not the femorotibial articular surface |
| 3C | Both condyles, extending into the intercondylar notch | Involves patellofemoral articular surface, but not the femorotibial articular surface |
| 4A | Medial condyle, extending to the femorotibial articular surface | |
| 4B | Lateral condyle, extending to the femorotibial articular surface | |
| 4C | Complex fractures | Comminuted, with any combination of the above |
Reference:
Seinsheimer, F., 3rd (1980). “Fractures of the distal femur.” Clin Orthop Relat Res (153): 169-179.