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Traumatic Leg Injury with Resulting Reflex Sympathetic Dystrophy (RSD). Shows how an initial injury to the lower extremity creates nerve impulses that begin an unbroken cycle of pain to the affected area. The results of this unbroken cycle of pain are persistent swelling and mottling of the skin. A final illustration pictures an anesthetic injection into the lumbar sympathetic chain in attempts to disrupt and break the cycle of pain.