Table 5. Preop, postop, and time of fusion segmental lordosis and posterior disk height for ALIF and LLIF.

	ALIF		LLIF
	Mean segmental angle (degrees)	Mean posterior disk height (mm)	Mean segmental angle (degrees)	Mean posterior disk height (mm)
Preop	14.6 ± 3.6	3.2 ± 1.1	9.9 ± 4.2	4.1 ± 1.7
Postop	21.9 ± 4.7	7.2 ± 1.3	12.6 ± 5.0	6.4 ± 1.6
Fusiona	21.0 ± 4.3	6.6 ± 1.2	12.3 ± 4.6	5.7 ± 1.6
p (preop and postop)	<0.0001	<0.0001	0.0001	<0.0001
p (preop and fusion)	0.0001	<0.0001	0.0034	0.0028
p (postop and fusion)	0.3318	0.0154	0.7802	0.0494

Abbreviations: ALIF, anterior lumbar interbody fusion; LLIF, lateral lumbar interbody fusion; preop, preoperative; postop, postoperative.

^aTime of fusion (range 6 to 24 months).