Table 3.

The deviations and N-D differences before and after surgery (PD)

	pre-op	1d post-op	1 m post-op	6 m post-op	Last Follow-up
At distance	− 26.09 ± 6.5 (−15 ~ − 35)	8.38 ± 8.08	− 2.88 ± 6.50	−0.82 ± 6.17	−2.18 ± 6.85
Median at distance	−25	+ 10	0	0	0
At near	−37.21 ± 6.30 (−25 ~ − 45)	4.06 ± 9.39	−4.24 ± 7.08	−3.47 ± 6.10	−4.53 ± 7.65
Median at near	−40	0	−4	−2	−4
N-D Difference	11.12 ± 2.06 (10 ~ 15)	4.97 ± 4.48	3.24 ± 3.04	3.24 ± 3.41	2.47 ± 3.04
Median of N-D	10	5	4	4	1
P value (Pre & Po)*		< 0.001	< 0.001	< 0.001	< 0.001

^*P-value: between the preoperation and the current angles at each time