A novel pedicle screw design to maximize screw-bone interface strength using finite element analysis and design of experiment techniques
- Author:
Arvind Kumar PRAJAPATI
1
;
Parimanathukovilakom Ramavarma HARIKRISHNA VARMA
;
Gurunathan SARAVANA KUMAR
;
Chirathody Vayalappil MURALEEDHARAN
;
Ganesh DIVAKAR
Author Information
- Publication Type:Basic Study
- From:Asian Spine Journal 2024;18(6):765-776
- CountryRepublic of Korea
- Language:English
-
Abstract:
Methods:We conceptualized a novel pedicle screw considering vertebral bone morphology and strength differences. A validated FE model was developed and used in conjunction with DoE to determine the screw՚s optimum geometrical parameters. The FE model was validated through simulation and laboratory experiments using the control device. The optimized thread profiles for cortical bone and cancellous bone were determined, with pull-out force as the primary factor for screw design evaluation.
Results:FE analysis results for the control device closely matched experimental results, with less than 5% difference. The chosen unique pitch/depth ratio showed maximum pull-out force for cortical bone, while DoE enabled the optimization of design parameters for cancellous bone. The optimized pedicle screw exhibited a 15% increase in pull-out force compared to the control device.
Conclusions:The study proposes a novel pedicle screw design with better pull-out strength than the control device. Combining FE analysis with DoE is an effective approach for screw design optimization, reducing the need for extensive prototyping tests. A two-variable analysis suffices for optimizing cortical bone design parameters, while a multi-variable analysis is more effective for optimizing cancellous bone design parameters.
