"Complex regional pain syndromes are painful conditions that usually affect the distal part of an upper or lower extremity and are associated with characteristic clinical phenomena (see Table 1 below). There are two subtypes -- CRPS Type I and CRPS Type II.
The term "complex regional pain syndrome" was introduced to replace the term "reflex sympathetic dystrophy." CRPS Type I used to be called reflex sympathetic dystrophy. CRPS Type II used to be called causalgia. The terminology was changed because the pathophysiology of CRPS is not known with certainty. It was determined that a descriptive term such as CRPS was preferable to "reflex sympathetic dystrophy" which carries with it the assumption that the sympathetic nervous system is important in the pathophysiology of the painful condition."
http://snipurl.com/he46I looked it up.
