Evaluation of the Effect of Fixation Angle between Polyaxial Pedicle Screw Head and Rod on the Failure of Screw-Rod Connection

Table 2

Statistical evaluation of test results.

	Maximum load	Pullout stiffness	Moment at maximum load	Minimum sagittal angle
6.5-V versus 6.5-A	0.0044^*	0.0000^*	0.5995	0.0655
7.0-V versus 7.0-A	0.0071^*	0.0014^*	0.1737	0.1407
7.5-V versus 7.5-A	0.1189	0.0050^*	0.6761	0.0667
6.5-V versus 7.0-V	0.0000^*	0.4978	0.0160^*	0.0889
7.0-V versus 7.5-V	0.0607	0.1363	0.8019	0.5525
6.5-V versus 7.5-V	0.0003^*	0.0498^*	0.0129^*	0.0479^*
6.5-A versus 7.0-A	0.0002^*	0.4577	0.0006^*	0.0056^*
7.0-A versus 7.5-A	0.6069	0.8324	0.6256	0.0507
6.5-A versus 7.5-A	0.0074^*	0.6592	0.0176^*	0.0620

Statistical difference.