Deviating from the Recommended Torque on Set Screws Can Reduce the Stability and Fatigue Life of Pedicle Screw Fixation Devices
Abstract
:1. Introduction
2. Materials and Methods
2.1. Axial Gipping Capacity (AGC) Testing
2.2. Dynamic Mechanical Testing of Bilateral Constructs
3. Results
3.1. Axial Gripping Capacity
3.2. Dynamic Mechanical Testing of Bilateral Construct
4. Discussion
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Pedicle Screw | A (Matrix) * | B (OCTOPODA) ** |
---|---|---|
Rod material | Ti alloy | Ti alloy |
Screw diameter (mm) | 4.0 | 4.0 |
Screw length (mm) | 30 | 30 |
Screw material | Ti alloy | Ti alloy |
Set screw material | Ti alloy | Ti alloy |
Tightening torque (Nm) | 9 (lower) 10 (Manufacturer recommended) 11 (higher) | 11 (lower) 12 (Manufacturer recommended) 13 (higher) |
Group (Torque Value of Set Screw) | Mean | SD * | p Value ** |
---|---|---|---|
A (9 Nm) | 1940.23 | 102.10 | 0.123 compared to A (10 Nm) |
A (10 Nm) | 2019.65 | 98.81 | - |
A (11 Nm) | 2067.30 | 105.66 | 0.241 compared to A (10 Nm) |
B (11 Nm) | 1651.23 | 88.05 | 0.031 |
B (12 Nm) | 1775.70 | 94.78 | - |
B (13 Nm) | 1818.97 | 69.25 | 0.216 |
Sample No. Group A | Torque Value of Set Screw (Nm) | Range of Axial Force (N) | Cycles to Failure |
---|---|---|---|
1 | 10 | 22~220 | 53,548 |
2 | 10 | 20~200 | 2,177,963 |
3 | 10 | 20~200 | 1,757,238 |
4 | 10 | 19~190 | Run-out |
5 | 10 | 19~190 | Run-out |
6 | 9 | 19~190 | Run-out |
7 | 9 | 19~190 | Run-out |
8 | 11 | 19~190 | Run-out |
9 | 11 | 19~190 | Run-out |
10 | 11 | 20~200 | 1,831,177 |
11 | 11 | 20~200 | 1,593,474 |
Group (Torque Value of Set Screw) | * Fatigue Strength (N) | Maximum Axial Force (N) | Failure Patten If Did Not Run-Out |
---|---|---|---|
A (9 Nm) | 190 | 22~220 | Screw fracture |
A (10 Nm) | |||
A (11 Nm) | |||
B (11 Nm) | 190 | 22~220 | Rod fracture |
B (12 Nm) | |||
B (13 Nm) | 170 | 19~190 |
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Wu, L.-C.; Hsieh, Y.-Y.; Tsuang, F.-Y.; Chiang, Y.-F.; Chiang, C.-J. Deviating from the Recommended Torque on Set Screws Can Reduce the Stability and Fatigue Life of Pedicle Screw Fixation Devices. Medicina 2022, 58, 808. https://doi.org/10.3390/medicina58060808
Wu L-C, Hsieh Y-Y, Tsuang F-Y, Chiang Y-F, Chiang C-J. Deviating from the Recommended Torque on Set Screws Can Reduce the Stability and Fatigue Life of Pedicle Screw Fixation Devices. Medicina. 2022; 58(6):808. https://doi.org/10.3390/medicina58060808
Chicago/Turabian StyleWu, Lien-Chen, Yueh-Ying Hsieh, Fon-Yih Tsuang, Yueh-Feng Chiang, and Chang-Jung Chiang. 2022. "Deviating from the Recommended Torque on Set Screws Can Reduce the Stability and Fatigue Life of Pedicle Screw Fixation Devices" Medicina 58, no. 6: 808. https://doi.org/10.3390/medicina58060808