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Computed Tomography and Optical Imaging of Osteogenesis-angiogenesis Coupling to Assess Integration of Cranial Bone Autografts and Allografts
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Translational Research for Orthopedic Bone Graft Development.

Maria J C Vilela1,2,3, Bruno J A Colaço4, José Ventura5

  • 1Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, 4200-135 Porto, Portugal.

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Summary

This study successfully scaled up the production of collagen and nanohydroxyapatite bone scaffolds. The optimized process yielded reproducible, non-cytotoxic scaffolds that promote bone regeneration and are suitable for commercialization.

Keywords:
biomaterialsbone regenerationcollagennanohydroxyapatitescaffold

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Orthopedic Research

Background:

  • Designing effective bone substitutes remains challenging due to the complex structure of natural bone tissue.
  • Existing scaffolds often require further development for large-scale production and clinical application.

Purpose of the Study:

  • To scale up the production of porous collagen/nanohydroxyapatite biocomposite scaffolds for bone regeneration.
  • To evaluate the physical, biological, and in vivo performance of the scaled-up scaffolds for orthopedic applications.

Main Methods:

  • Industrial-scale production using a prototype bioreactor.
  • Characterization via SEM, CLSM, DMA, cytotoxicity assays (L929, MG63, HBMSC), ALP activity, and qPCR.
  • In vivo implantation in rabbit tibia critical-size bone defects, followed by microCT and histological analysis.

Main Results:

  • Scaled-up scaffolds exhibited adequate mechanical resistance, viscoelastic properties, and water absorption.
  • Heteroporous morphology (microporosity and macroporosity) was confirmed, promoting cell interaction.
  • Scaffolds were non-cytotoxic, promoted human MSC osteogenic differentiation, and demonstrated bone ingrowth and degradation in vivo.

Conclusions:

  • The optimized, scaled-up production process yields reproducible biocomposite scaffolds with desirable properties.
  • These scaffolds are suitable for commercialization as medical devices for bone regeneration.
  • The successful upscaling bridges basic science knowledge with biomedical device development for improved human health.