Influencing factors of fixation strength of pedicle screws
10.3969/j.issn.2095-4344.2013.43.022
- VernacularTitle:影响椎弓根螺钉固定强度的相关因素
- Author:
Jianxin YIN
- Publication Type:Journal Article
- Keywords:
spinal fractures;
fracture fixation,internal;
bone nails;
bone density;
biomechanics
- From:
Chinese Journal of Tissue Engineering Research
2013;(43):7642-7647
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND:Pedicle screw is a good means for internal fixation and has been widely used in clinical practice. OBJECTIVE:To explore the factors influencing the fixation strength of pedicle screws, and to provide biomechanical basis for clinical selection of pedicle screws. METHODS:The recently published studies addressing the biomechanics of pedicle screws were retrieved, and those focusing on the influence of pedicle screw geometry, implantation technique, pedicle anatomical factor, vertebral bone density, screw manufacturing process and material properties on the fixation strength of pedicle screws were retrospectively analyzed, thus providing theoretical basis for clinical treatment. RESULTS AND CONCLUSION:Results showed that, the appearances of pedicle screws such as screw size, screw thread form and fatigue property are the main factors associated with the fixation strength, in addition, vertebral bone density, screw manufacturing process and material properties cannot be ignored. The screw withdrawal force and stability can be improved by increasing screw diameter, improving screw design, strengthening bone density, and modifying operations.
