Sub-Sensory Intraspinal Neurostimulation Therapy

Inclusion Criteria: * Primary pain complaint of persistent or recurrent low back and/or leg pain, with or without leg pain, for at least 180 days prior to Baseline. * Received a Boston Scientific SCS System with active contacts located between superior endplate of T7 and the inferior endplate of T10 with a minimum of three active contacts within this anatomical area. * No back surgery within 180 days prior to Baseline. * Has had stimulator "on" (activated or operational) for at least 36 hours prior to Baseline evaluation. * Average low back and/or leg pain intensity, during the position/activity which routinely causes worst pain, of 5 or greater on a 0-10 numerical rating scale without neurostimulation. * If taking prescription opioids for primary chronic pain complaint (low back and/or leg pain), must have been on a stable prescription (same drug(s) and dose(s)) for 30 days prior to Baseline * Consumed an average total daily morphine equivalent of ≤300 mg during the 30 days prior to Baseline * Willing and able to comply with all protocol-required procedures and assessments/evaluations (e.g. willing to comply with opioid prescription lock throughout the study, changes to the stimulation parameters, complete twice-daily diary) * 22 years of age or older when written informed consent is obtained * Able to independently read and complete all questionnaires and assessments provided in English * Subject signed a valid, IRB-approved informed consent form (ICF) provided in English …