Recent clinical investigations have suggested that the cause of abnormal pain in complex
regional pain syndrome could be ischemia and inflammation, due to poor blood flow to deep
tissues from microvascular pathology. This study aims to determine if a new technology called
near infrared spectroscopy can measure this microvascular dysfunction. The study hypothesizes
that significant differences can be measured in the microcirculation of patients with CRPS-I
using near infrared spectroscopy and the vascular occlusion test.