Evaluation of unilateral cage-instrumented fixation for lumbar spine

Table 1 The difference of ROM and NZ between unilateral and bilateral cage-instrumented PLIF over flexion-extension, lateral bending and axial rotation

Procedures		L		F		D		C		P
		unilateral	bilateral	unilateral	bilateral	unilateral	bilateral	unilateral	bilateral	unilateral	bilateral
Flexion Extension (°)	ROM (°)	1.9 ± 0.9	2.1 ± 0.8	0.5 ± 0.6	1.7 ± 0.7*	4.2 ± 1.1	7.1 ± 7.3	-10.4 ± 4.4	-13.6 ± 3.3	-3.7 ± 3.8	-5.8 ± 4.8
	NZ (°)	1.2 ± 0.8	1.8 ± 1.2	0.4 ± 0.6	0.3 ± 0.6	1.9 ± 2.4	2.3 ± 5.3	-5.8 ± 1.6	-5.8 ± 3.9	-0.2 ± 1.5	-1.0 ± 2.8
Lateral Bending (°)	ROM (°)	0.4 ± 0.4	0.2 ± 0.5	0.7 ± 0.7	0.1 ± 0.5	1.8 ± 1.6	3.7 ± 1.0*	-11.5 ± 2.6	-13.2 ± 2.2	-4.1 ± 1.7	-4.2 ± 1.7
	NZ (°)	0.4 ± 0.8	0.9 ±0.9	0.0 ± 0.8	0.0 ± 0.7	-0.6 ± 2.7	-1.6 ± 1.5	-3.1 ± 2.1	-1.5 ± 1.3	-0.1 ± 0.2	-0.2 ± 0.1
Rotation (°)	ROM (°)	0.4 ± 0.3	0.2 ± 0.3	0.4 ± 0.3	0.3 ± 0.4	0.7 ± 0.4	0.2 ± 0.3*	-0.6 ± 0.6	1.1 ± 0.9*	-0.7 ± 0.4	-1.7 ± 0.8*
	NZ (°)	0.1 ± 0.0	0.0 ± 0.1*	0.0 ± 0.1	0.0 ± 0.1	0.1 ± 0.1	-0.1 ± 0.1*	0.0 ± 0.2	0.3 ± 0.1*	-0.1 ± 0.1	-0.2 ± 0.1

L: Laminectomy, F: Facetectomy, D: Discetomy, C: Interbody Cage, P: Pedicle screw
Note:
L = (L-I): ROM and NZ of the specimen after laminectomy minus intact status
F = [(I +L+F)-(I+L)]: ROM and NZ of the specimen after facectomy minus laminectomy status
D = [(I+L+F+D)-(I +L+F)]: ROM and NZ of the specimen after discectomy minus facetectomy status
C = [(I+L+F+D+C)-(I+L+F+D)]: ROM and NZ of the specimen after interbody cage insertion minus discectomy status
P = [(I+L+F+D+C+P)-(I+L+F+D+C)]: ROM and NZ of the specimen after tranpedicle screw fixation minus interbody cage insertion status
*: significant: p <.05 compared with unilateral group.

ISSN: 1749-799X