Statistical analysis was performed using JMP 14 (SAS Institute, Inc), and statistical methods to evaluate differences among the 4 different groups included a 1-way analysis of variance before Tukey post hoc test for pairwise analysis. Differences in tension before and after screw insertion for the Screw-ALD and Screw-ALD ST groups were investigated using a paired t test and a Brown-Forsythe test for the equality of group variances. The significance level was set at P < .05 and the desired power at 0.8.

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