Table 1 The design parameters and the equivalent diameter functions of the six pedicle screws.
Pedicle Screw | Threaded Length | Outer Diameter | Inner Diameter | Screw Pitch | Equivalent Diameter Function (0≤x≤30) |
|---|---|---|---|---|---|
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 |
