Utilizes theory that non-noxious stimuli can reduce noxious pain perception.

Introduction of an electric current near the source of chronic pain impulses or along pain pathways.

Reversible, cost effective and non-pharmacologic.

These generators can vary the intensity, electrical field and the time of delivery of stimulation.

Prior to permanent placement of the device a stimulator trial is done: percutaneous placement of leads into the epidural space or close to pain generating nerves and if a 50% improvement in pain and function occur permanent placement of the stimulator can be achieved.

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