Table 2.

Clinical outcomes

	OLIF51	TLIF51	P
Preoperative VAS-L	6.9±1.2	7.0±1.4	NS
Postoperative VAS-L	1.9±1.0*	2.2±1.1*	NS
Preoperative VAS-B	7.0±1.3	6.7±1.7	NS
Postoperative VAS-B	2.9±0.7*	2.4±0.8*	NS
Preoperative ODI (%)	43.9±8.5	42.3±7.0	NS
Postoperative ODI (%)	14.6±5.2*	13.1±5.1*	NS

Values are presented as mean±standard deviation.

^*p<0.001 comparing to preoperative value.

OLIF51 : oblique lateral interbody fusion at L5–S1 level, TLIF51 : transforaminal lumbar interbody fusion at L5–S1 level, P : comparison between OLIF51 and TLIF51 groups, VAS-L : visual analog scale on leg pain, NS : non specific, VAS-B : visual analog scale on back pain, ODI : Oswestry disability index