Efficacy of Spinal Cord Stimulation for Failed Back Surgery Syndrome in Elderly Patients: A Retrospective Study

Table 2

VAS scores and responder rate between baseline and 1-year postoperative follow-up. A responder was defined as achieving at least a 50% improvement in pain compared to baseline VAS scores.

	<75 years old n = 27	≥75 years old n = 46	value
VAS mm (SD)
Low back pain
Baseline	78.6 (12.0)	78.0 (14.3)	0.936^†
1 year	28.7 (19.9)	31.6 (20.2)	0.391^†
Leg pain
Baseline	76.4 (17.3)	77.0 (14.2)	0.995^†
1 year	24.1 (15.8)	24.1 (18.6)	0.598^†
Overall pain
Baseline	84.3 (10.9)	85.8 (8.6)	0.775^†
1 year	30.0 (19.2)	32.5 (20.9)	0.511^†
Responder rate
Low back pain	81.5%	80.4%	1.000
Leg pain	81.5%	82.6%	1.000
Overall pain	81.5%	82.6%	1.000

Fisher’s exact test, ^†Mann–Whitney U test.