reflex sympathetic dystrophy CHORUS

Description: Sudeck dystrophy, causalgia, shoulder-hand syndrome, post-traumatic osteoporosis
* pain, tenderness, soft tissue swelling out of proportion to injury
* vasomotor instability (Raynaud, vasoconstriction/-dilation)
* end stage (6-12 months): contractures, atrophy (skin and soft tissues)
* location: hands and feet distal to injury
etiology
* injury (fracture, frost bite; may be trivial)
* immobilization
* infection
* myocardial infarction
findings
* periarticular soft tissue swelling
* patchy dimineralization
* increased uptake (periarticular) on bone scan
* perfusion and blood pool phases not sensitive