Comparison of a Multi-tined Cannula Versus a Conventional Cannula for Cervical Medial Branch Radiofrequency Ablation in Chronic Neck Pain

Inclusion Criteria: * 18 years or older * Cervical neck pain at least 4/10 at rest or with activity * Neck pain lasting at least 6 months and refractory to conservative treatments * Neck pain is primarily axial (more than upper extremity) * Success to medial branch block protocol Exclusion Criteria: * failure to medial branch block protocol (pain relief less than 75% on 2 occasions) * Cervical neck pain less than 4/10 * Neurological deficits of upper extremity * neuropathic pain of upper extremity * pregnancy or breastfeeding * inflammatory or neoplastic lesion on x-ray * neck cortisone injection in last 3 months * any medical or psychiatric condition contra-indicated for radiofrequency ablation