A retrospective cohort study comparing perioperative clinical outcomes and radiographic results between patients undergoing TLIF and OLIF surgeries

Table 4 Pain rating scale

	OLIF	TLIF	P
VAS of back
Preoperative	6.48 ± 0.42	6.45 ± 0.64	0.804
Postoperative	2.63 ± 0.89	2.89 ± 1.05	0.116
Follow-up	1.53 ± 0.76	1.87 ± 1.11	0.135
P	P1 < 0.001, P2 = 0.423	P1 < 0.001, P2 = 0.573
VAS of leg
Preoperative	6.30 ± 0.73	6.29 ± 0.70	0.893
Postoperative	2.81 ± 0.69	2.81 ± 0.63	0.973
Follow-up	1.71 ± 0.54	1.97 ± 1.07	0.307
P	P1 < 0.001, P2 = 0.431	P1 < 0.001, P2 = 0.541
ODI (%)
Preoperative	53.37 ± 2.73	54.37 ± 3.71	0.068
Postoperative	21.10 ± 2.54	25.64 ± 2.88	0.031
Follow-up	17.10 ± 3.54	21.73 ± 3.07	0.027
P	P1 < 0.001, P2 = 0.021	P1 < 0.001, P2 = 0.028
Achieved MCID at 1-year follow-up
Achieved MCID for VAS-low back	54 (90.0%)	51 (85.0%)	0.408
Achieved MCID for VAS-leg	55 (91.7%)	52 (86.7%)	0.378
Achieved MCID for ODI	56 (93.3%)	48 (80.0%)	0.032

Significant results with P < 0.05 in bold; VAS Visual Analog Scale, ODI Oswestry Disability Index, MCID minimal clinically important difference
P1 represents preoperative v.s. postoperative; P2 represents postoperative v.s. follow-up

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