Table 2.

ODI and VAS values^a

	Isobar TTL (n = 20)		Rigid (n = 21)
	ODI	VAS	ODI	VAS
Before surgery	81.84 ± 6.63	6.82 ± 1.77	82.21 ± 5.86	6.70 ± 1.51
After surgery	30.15 ± 4.38	2.75 ± 0.86	28.06 ± 5.39	2.58 ± 0.86
P	0.000	0.000	0.000	0.000
P ′		ODI (0.182)		VAS (0.530)

^aData are presented as mean ± standard deviation

P values are based on the paired t test. P is for postoperative values compared with preoperative values; P < 0.05. P′ is for the Isobar TTL group compared with the rigid group; P > 0.05 indicates a statistically significant difference