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Objective <p>To evaluate the biomechanical performance of a novel dual-cord and dual-spacer posterior dynamic stabilization system compared to a conventional single-threaded construct.</p> Methods <p>A validated finite element (FE) model of the L1–S1 lumbar spine was developed. Posterior dynamic stabilization was simulated at the L4–L5 segment using two systems: a traditional polyethylene terephthalate (PET) cord with polycarbonate urethane (PCU) spacer (single-threaded), and a dual PET cord–spacer construct. Both systems were analyzed under full range of motion (ROM) loading and physiological loads using Abaqus software to simulate stress distribution and motion.</p> Results <p>The dual-cord system enhanced segmental stability at L4–5 by approximately 22% while preserving adjacent level mobility within normal physiological limits. Peak stress levels on implant components increased marginally but remained within safe thresholds.</p> Conclusion <p>The dual-cord dynamic stabilization system demonstrates improved biomechanical stability with minimal adjacent segment compromise. These results support its potential for reducing long-term mechanical failure risks in lumbar stabilization.</p>

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Evaluating the performance of a novel double-threaded dynamic stabilization system: a finite element study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月17日

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  • Mehmet Yigit Akgun,
  • Melihcan Savasci,
  • Nazenin Durmus,
  • Caner Gunerbuyuk,
  • Tunc Oktenoglu,
  • Ozkan Ates,
  • Ali Fahir Ozer

摘要

Objective

To evaluate the biomechanical performance of a novel dual-cord and dual-spacer posterior dynamic stabilization system compared to a conventional single-threaded construct.

Methods

A validated finite element (FE) model of the L1–S1 lumbar spine was developed. Posterior dynamic stabilization was simulated at the L4–L5 segment using two systems: a traditional polyethylene terephthalate (PET) cord with polycarbonate urethane (PCU) spacer (single-threaded), and a dual PET cord–spacer construct. Both systems were analyzed under full range of motion (ROM) loading and physiological loads using Abaqus software to simulate stress distribution and motion.

Results

The dual-cord system enhanced segmental stability at L4–5 by approximately 22% while preserving adjacent level mobility within normal physiological limits. Peak stress levels on implant components increased marginally but remained within safe thresholds.

Conclusion

The dual-cord dynamic stabilization system demonstrates improved biomechanical stability with minimal adjacent segment compromise. These results support its potential for reducing long-term mechanical failure risks in lumbar stabilization.