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[Biomechanical effects of different bone cement diffusion patterns after vertebroplasty:finite element analysis].

Gong Yao1, Yi-Xin Shen1, Min Li1

  • 1Department of Orthopaedics, the Second Affiliated Hospital of Soochow University, Suzhou 215004, Jiangsu, China.

Zhongguo Gu Shang = China Journal of Orthopaedics and Traumatology
|August 23, 2021
PubMed
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Bone cement contacting both upper and lower endplates in vertebroplasty significantly reduces cancellous bone stress, lowering refracture risk in osteoporotic vertebral compression fractures.

Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Medical imaging analysis

Background:

  • Osteoporotic vertebral compression fractures (OVCFs) are a significant health concern.
  • Vertebroplasty is a common treatment for OVCFs, but optimal bone cement distribution remains under investigation.
  • Understanding biomechanical effects of cement patterns is crucial for improving treatment outcomes.

Purpose of the Study:

  • To investigate the biomechanical effects of different bone cement diffusion patterns in OVCF treatment.
  • To compare stress distribution and deformation in finite element models with varying cement contact areas.

Main Methods:

  • A 3D finite element model of a thoracolumbar segment with OVCF was created from CT scans.
  • Simulated vertebroplasty with three distinct bone cement dispersion patterns (no contact, upper endplate contact, both endplate contact).
Keywords:
Bone cementFinite element analysisPercutaneous vertebroplasty

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  • Applied various physiological loads and compared stress/deformation with a cementless model.

    • Main Results:

    • Bone cement significantly reduced Von Mises stress in cancellous bone compared to cementless models.
    • Cement contacting both upper and lower endplates resulted in the lowest cancellous bone stress.
    • Cement contacting neither endplate showed the highest cancellous bone stress, while cement contacting both endplates exhibited the highest bone cement stress.

    Conclusions:

    • Bone cement contacting both endplates effectively absorbs and transfers load-induced stress.
    • This optimal cement distribution reduces stress on cancellous bone, potentially decreasing refracture risk.
    • Finite element analysis provides valuable insights into biomechanical behavior following vertebroplasty.