Effects of Lordotic Angle of a Cage on Sagittal Alignment and Clinical Outcome in One Level Posterior Lumbar Interbody Fusion with Pedicle Screw Fixation

Table 3

Oswestry disability index and visual analogue scale of low back pain of both groups.

	Pre-op Oswestry	2 wk Oswestry	6-month Oswestry	1-year Oswestry	Pre-op VAS	2 wk VAS	6-month VAS	1-year VAS
PEEK (4)	23.1 (±5.5)	17.2 (±4.1)	13.4 (±4.0)	18.3 (±6.3)	7.3 (±1.2)	3.1 (±1.5)	2.5 (±1.5)	2.3 (±1.3)
PEEK (8)	24 (±5.4)	17.1 (±5.4)	12.9 (±4.2)	18.4 (±7.1)	7.4 (±1.7)	3.0 (±1.7)	2.3 (±1.3)	1.6 (±1.6)
value^*	0.399	0.959	0.633	0.084	0.844	0.889	0.612	0.150

By -test.