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Evaluating the performance of a novel double-threaded dynamic stabilization system: a finite element study
Mehmet Yigit Akgun1,2,3, Melihcan Savasci4, Nazenin Durmus5
1Department of Neurosurgery, Koc University Hospital, Istanbul, Turkey. myigitakgun@gmail.com.
Journal of Orthopaedic Surgery and Research
|October 17, 2025
Summary
A new dual-cord posterior dynamic stabilization system significantly improves lumbar spine stability by 22% compared to traditional methods. This advanced spinal stabilization technique also preserves adjacent segment mobility, reducing risks of mechanical failure.
Area of Science:
- Biomechanical Engineering
- Spinal Surgery
- Medical Device Technology
Background:
- Posterior dynamic stabilization (PDS) aims to improve spinal stability while preserving motion.
- Traditional PDS systems face challenges in optimizing stability and minimizing adjacent segment degeneration.
- Novel implant designs are crucial for advancing PDS efficacy.
Purpose of the Study:
- To compare the biomechanical performance of a novel dual-cord and dual-spacer PDS system against a conventional single-threaded construct.
- To evaluate the impact of the dual-cord system on segmental stability and adjacent level mobility.
- To assess the stress distribution within the implant components under physiological loading.
Main Methods:
- A validated finite element (FE) model of the L1-S1 lumbar spine was utilized.
- Two PDS systems were simulated at L4-L5: a single-threaded construct (PET cord/PCU spacer) and a dual PET cord-spacer construct.
- Simulations under full range of motion and physiological loads were performed using Abaqus software.
Main Results:
- The dual-cord system demonstrated a 22% enhancement in segmental stability at L4-L5.
- Adjacent level mobility was maintained within normal physiological limits with the dual-cord system.
- Implant component peak stress levels increased slightly but remained within safe operational thresholds.
Conclusions:
- The dual-cord dynamic stabilization system offers superior biomechanical stability compared to conventional systems.
- This novel system effectively minimizes compromise to adjacent spinal segments.
- The findings suggest the dual-cord system has potential for reducing long-term mechanical failure risks in lumbar stabilization procedures.
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