Peripheral Nerve Field Stimulation (PNfS) is implantable technology for the treatment of chronic, intractable pain. It works by delivering electrical impulses, and provides relief by altering the pain signals before they reach the brain. Instead of feeling the pain, you feel a tingling sensation. You are able to adjust the strength and area of stimulation using a remote control. When PNfS is successful, it should provide significant long term relief, reduce the need for pain medications, and improve function. To determine if the patient is a good candidate for PNfS therapy and permanent implantation, a PNfS trial will be performed first. The trial is temporary lasting up to a week, where the patient will learn and decide if this is the right treatment for them.