Short-term SCS for Refractory Diabetic Foot Neuropathic Pain

Inclusion Criteria: 1. Age ≥18 years; 2. Confirmed type 2 diabetes mellitus, Wagner grade 1-3 diabetic foot; 3. Persistent moderate-to-severe neuropathic pain (Numeric Rating Scale, NRS ≥4) after ≥3 months of standardized conservative treatment including glycemic control, neurotrophic drugs, multi-modal analgesia and wound care; 4. Contraindications to lower extremity revascularization surgery, persistent pain after revascularization, or voluntary refusal of vascular surgery; 5. Clear consciousness, capable of completing scale assessments and multi-timepoint follow-up; 6. Voluntary participation with signed written informed consent. Exclusion Criteria: 1. Spinal deformity, spinal infection, intraspinal tumor or history of spinal surgery, precluding epidural electrode implantation; 2. Severe coagulation disorders, systemic infection or uncontrolled severe active foot infection; 3. Severe dysfunction of heart, liver, kidney or respiratory system, unable to tolerate minimally invasive operation; 4. Previous spinal cord stimulation or peripheral nerve destructive surgery; 5. Psychiatric disorders interfering with assessment and follow-up cooperation; 6. Pregnant or lactating women; 7. Concurrent enrollment in other clinical trials targeting diabetic foot or chronic pain interventions.