Reflex Sympathetic Dystrophy Workup
- Author: Don R Revis Jr, MD; Chief Editor: Herbert S Diamond, MD more...
Laboratory Studies
- Levels of acute-phase reactants (ie, erythrocyte sedimentation rate [ESR], C-reactive protein) are generally within the reference range.
Imaging Studies
- Plain radiography
- Plain radiographs usually demonstrate pronounced demineralization in the underlying bony skeleton of the involved extremity (ie, Sudeck atrophy) that may become more severe with disease progression. No joint erosions are present.
- Demineralization begins at the ends of the bones and progresses to become homogeneous.
- Radionuclide imaging: Findings on 3-phase bone scan are positive in 50-90% of patients, and this study is most useful in early disease. Findings on the delayed image (ie, third phase) are generally abnormal, with increased uptake in the articular and periarticular structures of the involved extremity. Of course, this finding is not specific for reflex sympathetic dystrophy (RSD) but is supportive of that diagnosis in the appropriate clinical situation. In third-stage RSD, the bone scan findings may be normal, but the plain radiographs generally reveal profound demineralization of the affected extremity.
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