2.3. Inclusion criteria
stenosis, NRS, pain
STENOSIS
Age ≥20 years oldPain intensity ≥5 out of 11 on the numerical rating scale (NRS)Chronic LRP lasting ≥12 weeksPrevious failure of conservative management such as physiotherapy, exercise therapy, or analgesic medicationsLumbar spinal stenosis confirmed by magnetic resonance imagingPatients who received conventional fluoroscopy-guided diagnostic/therapeutic transforaminal epidural injections with local anesthetics and steroidsPatients who reported persistent pain (NRS score ≥5) after receiving TFESIPatients who received at least 2 epidural steroid injections in the 3 months preceding PRF treatment