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Review
Table 1.
Deep’s classification of knee deformity as it flexes from an extended position.
| Main group | Class/Type | Coronal deformity as the knee flexes from extension to 90° flexion |
|---|---|---|
| Neutral | ||
| Varus/Valgus | ||
| 1 | 1A | Deformity remains same |
| 1B | Deformity increases | |
| 2 | 2A | Deformity decreases but does not reach neutral |
| 2B | Deformity decreases and reaches neutral | |
| 3 | 3 | Deformity becomes opposite deformity (Varus becomes Valgus and Valgus becomes Varus) |
| 4 | 4A | Deformity 1st increases then decreases but does not reach neutral |
| 4B | Deformity 1st increases and then decreases to reach neutral | |
| 4C | Deformity 1st increases and then becomes opposite deformity (Varus becomes Valgus and Valgus becomes Varus) |
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