Pullout strength of reinserted pedicle screws using the previous entry point and trajectory
Abstract Purpose This study compared the biomechanics of reinserted pedicle screws using the previous entry point and trajectory with those of correctly inserted pedicle screws. Methods The study used 18 lumbar vertebrae (L1–6) from three fresh calf spines to insert 6.5 × 40-mm pedicle screws. A con...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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BMC
2019-07-01
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| Series: | Journal of Orthopaedic Surgery and Research |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s13018-019-1240-8 |
| _version_ | 1811187340935168000 |
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| author | Xuanwu Huang Zixiang Huang Liwei Xu Dongzhu Liang Meichao Zhang Hui Zhang |
| author_facet | Xuanwu Huang Zixiang Huang Liwei Xu Dongzhu Liang Meichao Zhang Hui Zhang |
| author_sort | Xuanwu Huang |
| collection | DOAJ |
| description | Abstract Purpose This study compared the biomechanics of reinserted pedicle screws using the previous entry point and trajectory with those of correctly inserted pedicle screws. Methods The study used 18 lumbar vertebrae (L1–6) from three fresh calf spines to insert 6.5 × 40-mm pedicle screws. A control screw was inserted correctly along the axis of one pedicle, while an experimental screw was reinserted completely using the previous entry point and trajectory in the other pedicle. The experimental screw was removed after being completely inserted in group A and after 80% of the total trajectory inserted in group B. And the experimental screw was removed after 60% of the total trajectory was reached in group C. The biomechanical values of the pedicle screws were measured. Results There were no significant differences in pedicle screw axial pullout strength between reinserted screws and correct screws in the 3 groups (P A = 0.463, P B = 0.753, P C = 0.753). Stiffness measurement increased for the reinserted screw compared with that of the control screw. Fracturing was observed between the vertebral body and pedicle. Conclusion Theoretically, a surgeon can remove the pedicle screw when necessary, inspect the trajectory, and reinsert the screw using the previous entry point and trajectory. |
| first_indexed | 2024-04-11T14:01:37Z |
| format | Article |
| id | doaj.art-8688d73215a9454280d174a7db370455 |
| institution | Directory Open Access Journal |
| issn | 1749-799X |
| language | English |
| last_indexed | 2024-04-11T14:01:37Z |
| publishDate | 2019-07-01 |
| publisher | BMC |
| record_format | Article |
| series | Journal of Orthopaedic Surgery and Research |
| spelling | doaj.art-8688d73215a9454280d174a7db3704552022-12-22T04:20:07ZengBMCJournal of Orthopaedic Surgery and Research1749-799X2019-07-011411610.1186/s13018-019-1240-8Pullout strength of reinserted pedicle screws using the previous entry point and trajectoryXuanwu Huang0Zixiang Huang1Liwei Xu2Dongzhu Liang3Meichao Zhang4Hui Zhang5Department of Orthopedics, Zhujiang Hospital, Southern Medical UniversityDepartment of Spine Surgery, Guangdong Second Provincial General HospitalThe Second School of Clinical Medicine, Southern Medical UniversityGuangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, Southern Medical UniversityGuangdong Provincial Key Laboratory of Medical Biomechanics, Department of Anatomy, Southern Medical UniversityThe Second School of Clinical Medicine, Southern Medical UniversityAbstract Purpose This study compared the biomechanics of reinserted pedicle screws using the previous entry point and trajectory with those of correctly inserted pedicle screws. Methods The study used 18 lumbar vertebrae (L1–6) from three fresh calf spines to insert 6.5 × 40-mm pedicle screws. A control screw was inserted correctly along the axis of one pedicle, while an experimental screw was reinserted completely using the previous entry point and trajectory in the other pedicle. The experimental screw was removed after being completely inserted in group A and after 80% of the total trajectory inserted in group B. And the experimental screw was removed after 60% of the total trajectory was reached in group C. The biomechanical values of the pedicle screws were measured. Results There were no significant differences in pedicle screw axial pullout strength between reinserted screws and correct screws in the 3 groups (P A = 0.463, P B = 0.753, P C = 0.753). Stiffness measurement increased for the reinserted screw compared with that of the control screw. Fracturing was observed between the vertebral body and pedicle. Conclusion Theoretically, a surgeon can remove the pedicle screw when necessary, inspect the trajectory, and reinsert the screw using the previous entry point and trajectory.http://link.springer.com/article/10.1186/s13018-019-1240-8Pedicle screwReinserted screwPullout strengthLumbar spineIn vitro study |
| spellingShingle | Xuanwu Huang Zixiang Huang Liwei Xu Dongzhu Liang Meichao Zhang Hui Zhang Pullout strength of reinserted pedicle screws using the previous entry point and trajectory Journal of Orthopaedic Surgery and Research Pedicle screw Reinserted screw Pullout strength Lumbar spine In vitro study |
| title | Pullout strength of reinserted pedicle screws using the previous entry point and trajectory |
| title_full | Pullout strength of reinserted pedicle screws using the previous entry point and trajectory |
| title_fullStr | Pullout strength of reinserted pedicle screws using the previous entry point and trajectory |
| title_full_unstemmed | Pullout strength of reinserted pedicle screws using the previous entry point and trajectory |
| title_short | Pullout strength of reinserted pedicle screws using the previous entry point and trajectory |
| title_sort | pullout strength of reinserted pedicle screws using the previous entry point and trajectory |
| topic | Pedicle screw Reinserted screw Pullout strength Lumbar spine In vitro study |
| url | http://link.springer.com/article/10.1186/s13018-019-1240-8 |
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