Ultrasound-Guided Lumbar Nerve Root Hydrodissection: Fluoroscopy-Assisted Evaluation of Injectate Distribution and Feasibility

Introduction: Selective nerve root block is commonly performed under fluoroscopy, but reports of ultrasound (US) guidance remain limited. Although hydrodissection has shown favorable outcomes in peripheral nerves, few studies have evaluated the lumbar nerve root. Therefore, we aimed to evaluate the injectate distribution, reproducibility, safety, and clinical efficacy of US-guided hydrodissection of the lumbar nerve root (US-HNR) using fluoroscopic assistance.