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Related Concept Videos

Porosity in Cement Paste01:18

Porosity in Cement Paste

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The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
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Assessing cement injection behaviour in cancellous bone: an in vitro study using flow models.

Antony Bou-Francis1, Alejandro López2, Cecilia Persson2

  • 1School of Mechanical Engineering, University of Leeds, UK a.boufrancis@leeds.ac.uk.

Journal of Biomaterials Applications
|June 11, 2014
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Summary
This summary is machine-generated.

This study introduces a new flow model to analyze bone cement injection during vertebroplasty. The method effectively differentiates cement properties and their impact on flow behavior and placement.

Keywords:
Bone cementbone surrogatescement flow behaviourcement leakagevertebral augmentation

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Area of Science:

  • Biomaterials Science
  • Medical Engineering
  • Orthopedic Surgery

Background:

  • Vertebroplasty cement injection and placement prediction are challenging due to a lack of standardized methods.
  • Understanding bone cement rheology is crucial for successful vertebroplasty procedures.

Purpose of the Study:

  • To develop and validate a novel, reproducible flow model for studying bone cement injection behavior.
  • To investigate the influence of cement properties and injection timing on flow dynamics and placement within a simulated vertebral body.

Main Methods:

  • Utilized a flow model with a bone marrow substitute, confined between glass and aluminum plates.
  • Injected four commercial bone cements at varying times post-mixing (4, 6, 8 min) at a constant flow rate (3 mL/min).
  • Measured injection force (peak pressure) using a load cell and monitored cement spread (time to boundary, filled area, roundness) via camera.

Main Results:

  • Peak injection pressures were clinically relevant and increased with injection time.
  • Cement formulations and model structure significantly influenced injection behavior.
  • Cements with similar composition/particle size exhibited comparable flow; model defects reduced spread and roundness.

Conclusions:

  • The proposed flow model offers a robust tool for differentiating bone cement formulations.
  • Quantitative analysis of cement spread provides insights into injection behavior and potential placement outcomes.
  • This method aids in understanding and optimizing bone cement properties for vertebroplasty.