Table 1: Relation screw diameter to pedicle diameter.

Pedicle diameter [mm]Screw diameter [mm]Ratio %
MeanStand.-dev.

Th16,90,2572,5
Th25,50,7590,1
Th34,80,14,594,8
Th450,24,590
Th55,30,74,584,9
Th65,90,5585,8
Th75,80,3556,2
Th85,70,1587,7
Th96,20,3580,6
Th106,41578,1
Th116,30,4589,4
Th127,40,6681,1