The Q2-Approach for Percutaneous Peripheral Neuromodulation Stimulator Implant Targeting C2 Dorsal Root Ganglion at C2 Lamina for Treating Intractable Headache: A Technical Note.

Objectives: Despite significant medical treatment advancements, interventional treatments for intractable headache disorders are limited. This study's objective is to detail a novel percutaneous approach ("Q2-approach") and its technical considerations for implanting peripheral neuromodulation stimulators (PNS) to the C2 dorsal root ganglion (C2-DRG) at C2 lamina, a previously unattempted target, as a treatment for intractable headache.

Design and methods: In an outpatient setting, PNS electrodes could be percutaneously implanted at C2-DRG in patients under moderate sedation using combined ultrasound and fluoroscopic guidance. The final electrode position was determined by intraoperative patient feedback to ensure optimal stimulation. Four patients were included to demonstrate technical parameters and feasibility. Follow-ups were conducted on postoperative days 10, 30, 60, and 100-120.

Results: The Q2-approach allows safe C2-DRG PNS implants in an outpatient setting. Average operative duration was <60 minutes. All four patients achieved >50% pain relief during the 60-day implant period and 3/4 demonstrated sustained benefit beyond the implant period. No complications (e.g., lead migration or infection) were observed.

Conclusions: The current technical note demonstrated the feasibility of a novel, safe, minimally invasive approach to access C2-DRG at the C2 lamina for the treatment of intractable headaches. The utilization of PNS on C2-DRG fills an important gap in headache management as it provides an alternative neuromodulation treatment modality to the existing destruction/denervation-based techniques.