Ultrasound Guided Cervical Selective Nerve Root Block Versus Fluoroscopic Guided Cervical Transforaminal Epidural Block

The following information is retrospectively collected and observed for comparison based on the electronic medical records of selected patients. 1. Patient characteristics: Age, height, weight, gender, lesion segment (e.g., C6/C7), comorbidities 2. Procedure-related indicators: 1\) Procedure method (US-CSNRB or FL-CTFEB) 2) Procedure site, procedure level, adverse events during the procedure 3) Contrast agent distribution pattern: Extent of contrast agent spread into the epidural space and into the nerve roots during the procedure 3. Treatment efficacy indicators: VAS (based on arm pain) at the first visit -baseline, the second visit - 1 month after procedure, the third visit - 2 month after procedure, and 4th visit - 3 months post-procedure; treatment success rate (VAS score reduction of 30% or more) 4. Safety indicators: Presence and type of procedure-related complications documented in medical records (e.g., intravascular injection, nerve injury, local anesthetic toxicity symptoms, transient motor paralysis, etc.).