Comparing the Efficacy of Combined Treatment with Medial Branch Block and Facet Joint Injection in Axial Low Back Pain

Table 2

Changes in the NRS score in the three groups before and after the intervention.

NRS	Before intervention	After intervention	Δ	Proportion of patients with >30% decrease in the NRS score (%, CI)	Intra- value	Inter- value
MBB (N = 33)	5.85 ± 1.54	4.58 ± 1.90	1.27 ± 1.64	39.4, 22.7–56.1	<0.001	0.774
FJI (N = 17)	6.06 ± 1.68	4.76 ± 1.75	1.29 ± 1.57	23.5, 3.4–43.7	0.003
MBB + FJI (N = 16)	5.13 ± 2.09	4.19 ± 2.07	0.94 ± 1.39	37.5, 13.8–61.2	0.028

Wilcoxon signed-rank test of difference. Kruskal–Wallis test. Prepost. Statistical significance. MBB, medial branch block; FJI, facet joint injection; MBB + FJI, combined treatment with MBB and FJI; NRS, Numeric Rating Scale; CI, confidence interval.