Difference between complex regional pain syndromes

What is the difference between complex regional pain syndromes I and II?

According to the International Association for the Study of Pain (IASP), complex regional pain syndrome I (CRPS I; formerly known as reflex sympathetic dystrophy) is defined as “continuous pain in a portion of an extremity after trauma, which may include fracture but does not involve a major nerve, associated with sympathetic hyperactivity.” The IASP defines CRPS II (formerly known as causalgia) as “burning pain, allodynia, and hyperpathia, usually in the foot or hand, after partial injury of a nerve or one of its major branches.”


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