Intermittent vs. Continuous Dorsal Root Ganglion Stimulation

Inclusion Criteria: * Subject is able to provide informed consent to participate in the study; * Subject is 21 years of age or older; * Subject has been treated with DRG-S permanent implant device (Abbott, Plano, TX, USA) for a minimum of 3 months with sustained pain relief \>50% for chronic intractable pain; * Subject's DRG-S parameters have remained unchanged for at least 30 days prior to the beginning of the study Exclusion Criteria: * Subject had a recent change in pain medication regimen resulting in increase in Morphine Milligram Equivalent dosing within 60 days prior to the beginning of the study * Subject received an additional pain interventional procedure within 60 days prior to the beginning of the study