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Dynamic stabilization is a motion-preserving alternative to spinal fusion that aims to suppress painful abnormal vertebral movements while maintaining segmental mobility. Spineshape S-IV represents an evolution of the well-established DYNESYS, offering modular stiffness through polymeric rods with different flexibilities for tailored biomechanical support based on the patient’s pathology. Physiologically relevant worst-case loads acting on a functional spinal unit (FSU) were derived from an analytical model and applied to human specimens. Fatigue testing under maximum loading conditions—+4.40/−1.40 mm (soft rod), +2.20/−0.70 mm (medium rod), and +1.10/−0.35 mm (hard rod)—for one million cycles demonstrated the viscoelastic stability and predictable hysteresis behavior of the polymeric rods. Clinical evaluations showed that spineshape S-IV effectively preserves a controlled range of motion (ROM). Furthermore, long-term data indicate excellent biocompatibility, and lower rates of revision surgeries due to adjacent segment disease (ASD) with dynamic stabilization compared to fusion systems.

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Biomechanical Analysis of Different Dynamic Rods Used with Rigid Screws

  • 章节

  • 发表日期：

    2026年

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  • Freudiger Stefan,
  • Cathrein Philipp,
  • Abramovic Sarah,
  • Lorrain Michel,
  • Dubois Gilles

摘要

Dynamic stabilization is a motion-preserving alternative to spinal fusion that aims to suppress painful abnormal vertebral movements while maintaining segmental mobility. Spineshape S-IV represents an evolution of the well-established DYNESYS, offering modular stiffness through polymeric rods with different flexibilities for tailored biomechanical support based on the patient’s pathology. Physiologically relevant worst-case loads acting on a functional spinal unit (FSU) were derived from an analytical model and applied to human specimens. Fatigue testing under maximum loading conditions—+4.40/−1.40 mm (soft rod), +2.20/−0.70 mm (medium rod), and +1.10/−0.35 mm (hard rod)—for one million cycles demonstrated the viscoelastic stability and predictable hysteresis behavior of the polymeric rods. Clinical evaluations showed that spineshape S-IV effectively preserves a controlled range of motion (ROM). Furthermore, long-term data indicate excellent biocompatibility, and lower rates of revision surgeries due to adjacent segment disease (ASD) with dynamic stabilization compared to fusion systems.