Radiofrequency stimulation of intervertebral discs

Area of Science:

• Spinal Medicine
• Pain Management
• Neuroscience

Background:

• Discogenic pain etiology is unclear, with nociceptors in the annulus fibrosis implicated.
• Disc injury is associated with neural ingrowth (neoneuralization) into the annulus.
• Intradiscal Electrodothermal Therapy (IDET) is thought to work by lesioning these nociceptors.

Purpose of the Study:

• To evaluate the ability of an intraannular electrode to selectively stimulate pain fibers in the disc annulus.
• To assess the implications for the neoneuralization theory and IDET mechanism.

Main Methods:

• Five patients with suspected discogenic pain were studied.
• An intraannular electrode (Radionics discTRODE) was used to attempt selective nerve fiber stimulation.
• Stimulation parameters were varied across different disc levels.

Main Results:

• Selective stimulation of axial pain fibers was not achievable with the tested system.
• Radicular stimulation was consistently observed in all patients and at all tested levels.
• The findings question the ability to target specific pain pathways within the disc.

Conclusions:

• The study challenges the concept of selective nociceptor targeting for discogenic pain relief.
• Current technology may not support the proposed mechanism of action for IDET.
• Further research is needed to understand discogenic pain mechanisms and develop effective treatments.