Table 2.

Effect of reducing postoperative IV rotation on AV

Rotation angle of IV	Rotation angle of AV (X ± S) (°)		P
	Preoperative	Final follow up
Reduced	4.6 ± 2.3	2.7 ± 2.1	< 0.001*
Not reduced	6.7 ± 3.6	5.8 ± 3.2	0.121

^{IV, Instrumented vertebrae. AV, Adjacent Vertebrae}

^{*, Represents a significant difference between the two groups(P<0.05)}