Fig. 5. Comparison of VAS scores according to the degree of spinal canal compromise (less than 33.3%, between 33.3 to 66.7%, and more than 66.7%) at 0, 1, 3, 6, 12, and 24 months after treatment. No statistically significant differences (p<0.05) were observed between the groups during the follow-up periods. VAS, Visual Analog Scale.