Evaluation of Medication Tapering on the Sensitivity of the Spinal Cord Using Closed-Loop Spinal Cord Stimulation (Pilot Study)

Inclusion Criteria: * Candidate for SCS and scheduled for trial with Evoke system. * Diagnosis of FBSS or FNSS (PSPS-T2). * Current use of ≥1 qualifying pain medication at or above minimum daily dose: * Gabapentin ≥150 mg * Pregabalin ≥75 mg * Morphine ≥40 mg * Hydromorphone ≥10 mg * Oxycodone ≥20 mg * Fentanyl ≥25 µg * Signed informed consent. * Age ≥18 years. Exclusion Criteria: * Active disruptive psychiatric disorder or condition impacting pain perception or compliance. * Progressive neurological disease (MS, CIDP, progressive arachnoiditis, progressive diabetic neuropathy, brain/spinal tumor, severe spinal stenosis). * Coagulation disorder, platelet dysfunction, progressive vascular disease, or uncontrolled diabetes with procedural risk. * Active systemic or local infection. * Pregnancy. * Significant untreated addiction or substance abuse (within 6 months prior)