Because CRPS-1 is commonly associated with other injuries, it is essential that all related diagnoses are defined and treated. Starts at the time of injury or even weeks later, associated with spontaneous pain, aching, burning, typically restricted to the distal extremity. May be sharp or lancinating. Frequently is present without provocation or movement. Sudomotor sign - increased sweating of the involved extremity.
Confirmatory tests are negative.
Positive response to sympathetic nerve blocks, particularly in the early stages. These might include general laboratory studies, EMG and nerve conduction studies, radiological examinations, including triple phase bone scan, thermography with autonomic stress testing, or selective tissue conductance testing. Onset of severe, burning pain closely limited to the site of injury 2. Localized edema 4. Muscle spasm 5.