Frostbite injuries of the extremities | Grade 1 | Grade 2 | Grade 3 | Grade 4 |
Extent of initial lesion at day 0 after rapid rewarming | Absence of initial lesion | Initial lesion on distal phalanx | Initial lesion on intermediary and proximal phalanx | Initial lesion on carpal/ tarsal |
Bone scanning at day 2 | Useless | Hypofixation of radiotracer uptake area | Absence of radiotracer uptake area on the digit | Absence of radiotracer uptake area on the carpal/tarsal |
Blisters at day 2 | Absence of blisters | Clear blisters | Hemorrhagic blisters on the digit | Hemorrhagic blisters over carpal/tarsal |
Prognosis at day 2 | No amputation | Tissue amputation | Bone amputation of digit | Bone amputation of the limb ± systemic involvement ± sepsis |
No sequelae | Fingernail sequelae | Functional sequelae | Functional sequelae |
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