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Table 2 Classification scheme for the severity of frostbite injury [19]

From: Frostbite: a practical approach to hospital management

Frostbite injuries of the extremity

Grade 1

Grade 2

Grade 3

Grade 4

Extent of initial lesion at day 0 after 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 on the digit

Absence of radiotracer uptake area on the carpal/tarsal region

Blisters at day 2

Absence of blisters

Clear blisters

Haemorrhagic blisters on the digit

Haemorrhagic blisters over carpal/tarsal region

Prognosis at day 2

No amputation

Tissue amputation

Bone amputation of digit

Bone amputation of the limb

No sequelae

Fingernail sequelae

Functional sequelae

+/− systemic involvement

    

+/− sepsis functional sequelae