• Stage I: acute/reversible stage.
This stage of vasodilation lasts 3 weeks to 6 months. Pain, the predominant feature, is usually out of proportion to the severity of the injury. There is hyperhidrosis, warmth, erythema, rapid nail growth, and edema in the distal extremity.
• Stage II: dystrophic or vasoconstriction (ischemic) stage.
This stage lasts 3 to 6 months. It is characterized by sympathetic hyperactivity, burning pain, and hyperesthesia exacerbated by cold weather. There is mottling and coldness, brittle nails, and osteoporosis.
• Stage III: atrophic stage.
This stage is characterized by pain either decreasing or becoming worse and by severe osteoporosis. Muscle wasting and contractures may occur. The condition can last for months or years, but spontaneous recovery often occurs within 18 to 24 months.
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