Table 3.5.
Clinical stages of major limb amputation risk based on Wound, Ischemia, and foot Infection (WIfI) classification
| Risk of amputation | Proposed clinical stages | WIfI spectrum score |
|---|---|---|
|
| ||
| Very low | Stage 1 | W0 I0 fI0,1 |
| W0 I1 fI0 | ||
| W1 I0 fI0,1 | ||
| W1 I1 fI 0 | ||
| Low | Stage 2 | W0 I0 fI2 |
| W0 I1 fI1 | ||
| W0 I2 fI0,1 | ||
| Wo I3 fI0 | ||
| W1 I0 fI2 | ||
| W1 I1 fI1 | ||
| W1 I2 fi0 | ||
| W2 I0 fI0/1 | ||
| Moderate | Stage 3 | W0 I0 fI3 |
| W0 I2 fI1,2 | ||
| W0 I3 fI1,2 | ||
| W1 I0 fI3 | ||
| W1 I1 fI2 | ||
| W1 I2 fI1 | ||
| W1 I3 fI0,1 | ||
| W2 I0 fI2 | ||
| W2 I 1 fI0,1 | ||
| W2 I2 fi0 | ||
| W3 I0 fi0,1 | ||
| High | Stage 4 | W0 I1,2,3 fI3 |
| W1 I1 fI3 | ||
| W1 I2,3 fI2,3 | ||
| W2 I0 fi3 | ||
| W2 I1 fI2,3 | ||
| W2 I2 fi1,2,3 | ||
| W2 I3 fI0,1,2,3 | ||
| W3 I0 fI2,3 | ||
| W3 I1,2,3 fI0,1,2,3 | ||
Clinical descriptors:Stage 1: minimal ischemia; no/minor tissue loss.-Stages 2–4 reflect increasing stages of ischemia, wound, and infection. Stage 5 (not shown in table): unsalvageable foot (most often due to wound extent or severity of infection).