Comparison of the short-term effects of lumbar endoscopic and microscopic tubular unilateral laminotomy with bilateral decompression in the treatment of elderly patients with lumbar spinal stenosis

Table 2 Comparison of operative and post-operative data between the 2 groups

Variables	Observation group (n = 20)	Control group (n = 20)	P value
Operation time (min)	59.93 ± 10.46	77.66 ± 12.44	< 0.001
Volume of blood loss (ml)	21.06 ± 4.59	51.00 ± 10.02	< 0.001
No. of X-ray exposures	24.54 ± 4.50	22.03 ± 4.12	0.073
Level of surgery (n, %)			0.327
L4/5	9 (45.00)	6 (30.00)
L5/S1	11 (55.00)	14 (70.00)
Post-operative complications (n, %)	2 (10.00)	4 (20.00)	0.661
Post-operative day 3 VAS	1.90 ± 0.85	2.00 ± 1.08	0.746
Post-operative months 3 VAS	1.10 ± 0.31	1.20 ± 0.41	0.389
Post-operative months 6 VAS	1.25 ± 0.44	1.30 ± 0.57	0.759
Post-operative day 3 ODI	0.33 ± 0.06	0.37 ± 0.05	0.022
Post-operative months 3 ODI	0.28 ± 0.06	0.30 ± 0.05	0.189
Post-operative months 6 ODI	0.21 ± 0.07	0.22 ± 0.04	0.444

ISSN: 2047-783X