Research Article
Effects of the Insertion Type and Depth on the Pedicle Screw Pullout Strength: A Finite Element Study
Figure 9
The ultimate pullout effort computed in large deformations as a function of the implantation depth represented by the number of geared threads: two, five, eight, eleven, and fourteen threads (2T, 5T, 8T, 11T, and 14T, resp.).