Table 2.

Surgical outcomes

	OLIF (n = 32)	OLIF+PPSF (n = 41)	P
VAS (back pain)
Pre-op	8.6 ± 0.5	8.4 ± 0.8	0.241
Post-op 1 week	4.1 ± 0.7	5.7 ± 0.9	< 0.001
Post-op 3 months	2.2 ± 0.4	2.5 ± 0.8	0.030
Post-op 2 years	0.8 ± 0.7	0.9 ± 0.7	0.831
JOA score
Pre-op	4.0 ± 1.6	4.2 ± 1.3	0.636
Post-op 1 week	10.9 ± 1.3	8.8 ± 1.4	< 0.001
Post-op 3 months	13.1 ± 0.8	10.1 ± 1.2	< 0.001
Post-op 2 years	14.1 ± 0.7	13.6 ± 1.1	0.055
Adjacent segment degeneration	0	2 (4.9%)	0.125

OLIF Oblique lateral interbody fusion, PPSF Percutaneous pedicle screw fixation, VAS Visual analog scale, JOA Japanese Orthopaedic Association