The Clinical Effects of C2 and C3 Medial Branch Block for Medically Intractable Headache : a Retrospective Study

This study aimed to evaluate the clinical effects of medial branch blocks (MBBs) C2 and C3 in treating patients with medically intractable headaches. The medical records of 81 patients with medically intractable headaches who underwent a C2/3 MBB between January 2019 and March 2022 were retrospectively reviewed. The degrees of pain were evaluated using a Visual analogue scale (VAS) score (rating 0-10) on baseline and after procedures. To evaluate patients' satisfaction for the treatment, self-reporting measurements were examined and were categorized as excellent (>90% pain relief), good (50-90% pain relief), fair (10-50% pain relief), and none (