Table 2.

The back pain VAS and ODI score preoperatively and at each time point postoperatively (n = 29, mean ± standard deviation).

	Preoperation	Postop 1 day	Postop 1 month	Postop 6 months	Postop 12 month	Last follow-up
BP-VAS	8.37 ± 1.06	2.45 ± 1.21∗	2.26 ± 1.13∗	2.13 ± 0.97∗	2.16 ± 1.01∗	2.12 ± 0.92∗
ODI	73.60 ± 10.23	26.33 ± 5.17∗	22.87 ± 4.62∗	20.15 ± 3.93∗	19.82 ± 3.61∗	20.07 ± 3.24∗

Note. ^∗ P < 0.05, score at each time point postoperatively vs. preoperative score. Postop: postoperative; BP-VAS: back pain VAS. Last follow-up occurred at 19.6 months on average, ranging from 16 to 24 months.