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Table 1 The design parameters and the equivalent diameter functions of the six pedicle screws.

From: Comparison and prediction of pullout strength of conical and cylindrical pedicle screws within synthetic bone

Pedicle Screw Threaded Length Outer Diameter Inner Diameter Screw Pitch Equivalent Diameter Function
(0≤x30)
UPS-4 37 6.0
(0≤ x≤ 37)
3.8
(x = 0)
5.4
(x = 30)
2.4 D o (x) = 6.0
UPS-3 37 6.0
(0≤ x≤ 37)
4.0
(0≤ x≤ 37)
2.5 D o (x) = 6.0
D i (x) = 4.0
Diapason 40 4.6
(x = 0)
6.0
(x = 30)
2.6
(x = 0)
5.0
(x = 30)
1.75
HCD 40 6.0
(0≤ x≤ 40)
4.2
(0≤ x≤ 30)
5.6
(x = 40)
2.7 D o (x) = 6.0
D i (x) = 4.2
CCD 30 6.0
(0≤ x≤ 30)
4.5
(0≤ x≤ 30)
2.8 D o (x) = 6.0
D i (x) = 2.8
Moss-Miami 35.5 6.0
(0≤ x≤ 35.5)
4.0
(0≤ x≤ 35.5)
2.9 D o (x) = 6.0
D i (x) = 2.9
  1. Unit: mm.