Table 3.

Univariate logistic regression of the technical factors associated with treatment outcomes for genicular radiofrequency denervation

Variable	Positive outcome (n = 131)	Negative outcome (n = 75)	OR (95% CI)	P value
Prognostic block Yes No	106 (80.9) 25 (19.1)	46 (61.3) 29 (38.7)	2.673 (1.414, 5.050) 1 (Ref)	0.002*
Targeted nerves 3 nerves 5 nerves	87 (66.4) 44 (33.6)	68 (90.7) 7 (9.3)	1 (Ref) 4.91 (2.082, 11.590)	< 0.001*
Lesion time (sec) ≥ 90 < 90	105 (80.2) 26 (19.8)	54 (72.0) 21 (28.0)	1.57 (0.810, 3.050) 1 (Ref)	0.181
Sedation Yes No	63 68	30 45	1.39 (0.782, 2.470) 1 (Ref)	0.262

Values are presented as number (%) or number only.

Positive outcome was described as 50% or more reduction of NRS lasting at least 6 months. Negative outcome defines as < 50% pain relief or not lasting for 6 months.

P value compares positive outcome vs. negative outcome.

Three nerves consisted of superomedial, superolateral and inferomedial genicular nerves. Five nerves consisted of superomedial, superolateral and inferomedial genicular nerves, infrapatellar branch of the saphenous nerve and recurrent fibular nerve.

OR: odds ratio, CI: confidence interval, Ref: reference.

*If P < 0.05, it was considered statistically significant.