Adjacent Segment Degeneration after Short-Segment Lateral Lumbar Interbody Fusion (LLIF)

Table 2

Results of univariate analysis for developing ASD 2 years after LLIF.

	ASD (+)	ASD (-)	P
N	19	78
Age, years	70.4 ± 6.6	70.2 ± 7.1	0.901
Sex (female), %	52.6	59	0.616
Number of fixation levels	1.5 ± 0.5	1.5 ± 0.5	0.996
Posterior fixation method (PPS), %	42.1	57.7	0.221
Adjacent level decompression, %	21.1	3.8	0.035
Facet violation, %	15.8	14.1	0.86
Radiographic parameters
Lumbar lordosis, degrees	38.8 ± 14.9	44.5 ± 12.2	0.091
L4-S angle, degrees	26.0 ± 8.4	25.9 ± 8.6	0.977
PI-LL mismatch, %	52.6	47.4	0.684
△Lordosis, degrees	7.8 ± 7.1	7.1 ± 7.8	0.713
△Intervertebral height, mm	4.6 ± 2.2	5.0 ± 2.8	0.488

ASD: adjacent segment disease at 2 years; PPS: percutaneous pedicle screw; PI: pelvic incidence; LL: lumbar lordosis; △Lordosis: local lordosis acquisition; △Intervertebral height: intervertebral height restoration.