Table 1.
Classification system based on mechanism of injury.
| Classification | Primary injury | Secondary injury | Reduction mechanism | ||
|---|---|---|---|---|---|
| Varus (VR) | I | Mild varus | Medial condyle fracture with/without coronal split | Valgus | |
| II | Severe Varus | Medial condyle fracture with/without coronal split | Lateral condyle fracture | Valgus | |
| III | Varus + Axial compression | Medial condyle fracture with/without coronal split | Lateral condyle subluxation with depression/split depression | Valgus + Traction | |
| Varus flexion (VRF) | I | Mild varus | Postero-medial condyle fracture | Valgus + Extension | |
| II | Severe varus | Postero-medial condyle fracture | Lateral condyle fracture | Valgus + Extension | |
| III | Varus + Axial compression | Postero-medial condyle fracture | Lateral condyle subluxation with depression/split depression | Valgus + Extension + Traction | |
| Varus hyperextension (VRE) | I | Mild varus | Antero-medial condyle fracture | Valgus + Flexion | |
| II | Severe varus | Antero-medial condyle fracture | Lateral condyle fracture | Valgus + Flexion | |
| III | Varus + Axial compression | Antero-medial condyle fracture | Lateral condyle subluxation with depression/split depression | Valgus + Flexion + Traction | |
| Valgus (VL) | I | Mild valgus | Lateral condyle depresson/split depression | Varus | |
| II | Severe valgus | Lateral condyle depresson/split depression | Medial condyle fracture | Varus | |
| III | Valgus + Axial compression | Lateral condyle depresson/split depression | Medial condyle subluxation | Varus + Traction | |
| Valgus flexion (VLF) | I | Mild valgus | Postero-lateral condyle fracture | Varus + Extension | |
| II | Severe valgus | Postero-lateral condyle fracture | Medial condyle fracture | Varus + Extension | |
| III | Valgus + Axial compression | Postero-lateral condyle fracture | Medial condyle subluxation | Varus + Extension + Traction | |
| Valgus hyperextension (VLE) | I | Mild valgus | Antero-lateral condyle fracture | Varus + Flexion | |
| II | Severe valgus | Antero-lateral condyle fracture | Medial condyle fracture | Varus + Flexion | |
| III | Valgus + Axial compression | Antero-lateral condyle fracture | Medial condyle subluxation | Varus + Flexion + Traction | |