Table 2.

Functional impairment score and pain index score.

Parameter	Record time	Group A	Group B	P value
VAS	Preop	7.22 ± 0.82	7.33 ± 0.89	0.400
	Postop 3d	2.95 ± 0.71	2.76 ± 0.54	0.401
	Postop 3m	2.95 ± 0.67	2.93 ± 0.47	0.056
	Postop 3y	3.19 ± 1.12	2.80 ± 0.69	0.003
ODI	Preop	66.56 ± 4.20	68.50 ± 4.97	0.123
	Postop 3d	26.07 ± 2.68	26.30 ± 2.59	0.751
	Postop 3m	26.53 ± 2.57	26.27 ± 2.22	0122
	Postop 3y	29.14 ± 4.19	25.22 ± 3.11	0.018

Preop, preoperation; Postop 3d, three days after operation; Postop 3m, three months after operation; Postop 3y, three years after operation; ODI, Oswestry disability index; VAS, visual analog scale. Font bold indicates statistical difference, P < 0.05.