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Background <p>To address the surgical challenges and postoperative implant displacement associated with conventional internal fixation techniques in posterior cervical double-door laminoplasty, we developed the double-door screw-plate system (DDSPS).</p> Purpose <p>This study aimed to evaluate the biomechanical effects of DDSPS using finite element (FE) analysis.</p> Methods <p>An intact adult cervical spine FE model and three postoperative fixation models representing the DDSPS, the LA lamina staple, and the hydroxyapatite (HA) spacer construct were developed. Under a 75&#xa0;N follower load and a 2.0&#xa0;N·m moment applied in six loading directions, ROM, mean von Mises stress, implant-bone interface micromotion, and DDSPS stress distribution were evaluated.</p> Results <p>Across the six loading directions, all three postoperative models showed a similar overall kinematic pattern, with the greatest increase in ROM occurring during flexion and only limited changes in the remaining directions. The DDSPS and LA lamina staple models demonstrated markedly lower implant-bone interface micromotion than the HA spacer model (DDSPS CSLIP1/2: 0.0008/0.0021&#xa0;mm; LA lamina staple: 0.0020/0.0019&#xa0;mm; HA spacer: 0.2506/0.1560&#xa0;mm). In the DDSPS model, implant stress was mainly concentrated around the connecting axis, the plate surrounding the axial-side screw holes, and the axial-side fixation screws, with maximum stresses of 48.70&#xa0;MPa in the plate and 67.09&#xa0;MPa in the screw.</p> Conclusion <p>Within the present finite element framework, the double-door screw-plate system (DDSPS) demonstrated a more favorable initial biomechanical profile, including lower interface micromotion and greater construct stability than the reference constructs.</p>

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Finite element biomechanical evaluation of a novel double-door screw-plate system for posterior cervical laminoplasty

  • 期刊论文

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  • 发表日期：

    2026年7月13日

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  • Zhihao Kang,
  • Kaibin Wang,
  • Haipeng Si,
  • Chongyi Wang,
  • Yanwei Zhang,
  • Wencan Zhang,
  • Junfei Chen,
  • Chen Liu,
  • Yunze Feng,
  • Wanlong Xu,
  • Le Li

摘要

Background

To address the surgical challenges and postoperative implant displacement associated with conventional internal fixation techniques in posterior cervical double-door laminoplasty, we developed the double-door screw-plate system (DDSPS).

Purpose

This study aimed to evaluate the biomechanical effects of DDSPS using finite element (FE) analysis.

Methods

An intact adult cervical spine FE model and three postoperative fixation models representing the DDSPS, the LA lamina staple, and the hydroxyapatite (HA) spacer construct were developed. Under a 75 N follower load and a 2.0 N·m moment applied in six loading directions, ROM, mean von Mises stress, implant-bone interface micromotion, and DDSPS stress distribution were evaluated.

Results

Across the six loading directions, all three postoperative models showed a similar overall kinematic pattern, with the greatest increase in ROM occurring during flexion and only limited changes in the remaining directions. The DDSPS and LA lamina staple models demonstrated markedly lower implant-bone interface micromotion than the HA spacer model (DDSPS CSLIP1/2: 0.0008/0.0021 mm; LA lamina staple: 0.0020/0.0019 mm; HA spacer: 0.2506/0.1560 mm). In the DDSPS model, implant stress was mainly concentrated around the connecting axis, the plate surrounding the axial-side screw holes, and the axial-side fixation screws, with maximum stresses of 48.70 MPa in the plate and 67.09 MPa in the screw.

Conclusion

Within the present finite element framework, the double-door screw-plate system (DDSPS) demonstrated a more favorable initial biomechanical profile, including lower interface micromotion and greater construct stability than the reference constructs.