Table 3.

The P values of VAS score between every two time points by LSD.

Time point	preoperation	1 mon- post-op	3 mon- post-op	6 mon- post-op	12 mon- post-op	24 mon- post-op
1 mon- post-op	< 0.001*	–	< 0.001*	< 0.001*	< 0.001*	< 0.001*
3 mon- post-op	< 0.001*	< 0.001*	–	< 0.001*	< 0.001*	< 0.001*
6 mon- post-op	< 0.001*	< 0.001*	< 0.001*	–	< 0.014*	< 0.001*
12 mon- post-op	< 0.001*	< 0.001*	< 0.001*	0.014*	–	0.579
24 mon- post-op	< 0.001*	< 0.001*	< 0.001*	< 0.001*	0.579	–

VAS visual analogue scale, mon- month or months, post-op postoperation.

*Difference was statistically significant; “–” The same time point;