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In vivo hydroxyapatite scaffold performance in infected bone defects.

Joseph J Pearson1,2, Nicholas Gerken2,3, Chunsik Bae4

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PubMed
Summary

This study shows hydroxyapatite (HA) scaffolds are a viable alternative to bone autografts for critical-sized bone defects. HA scaffolds demonstrated superior bone mineralization and quality, even in infected defects, offering a promising solution to current treatment limitations.

Keywords:
bone graftcalcium phosphate(s)hydroxyapatiteinfection

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Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Regenerative Medicine

Background:

  • Critically sized bone defects present significant clinical challenges, often complicated by infection.
  • Current treatments like bone autografts have limitations including donor site morbidity and antibiotic resistance.
  • There is a need for effective alternatives to autografts in treating bone defects, especially those with infectious complications.

Purpose of the Study:

  • To evaluate a porous hydroxyapatite (HA) scaffold as an alternative to pulverized autograft (PBA) for critical-sized bone defects.
  • To assess the efficacy of HA scaffolds in both aseptic and septic environments, with and without antibiotic treatment.
  • To compare bone quality and quantity between HA scaffolds and autografts.

Main Methods:

  • A critical-sized femoral defect model was created in 24 New Zealand white rabbits.
  • Rabbits received either HA scaffolds or PBA, in aseptic or septic conditions, with or without antibiotics.
  • Bone regeneration was assessed using micro computed tomography, histology, and white blood cell analysis post-euthanasia.

Main Results:

  • Hydroxyapatite scaffolds showed significantly greater mineralization to total volume compared to autografts (27.56% vs. 14.88%, p < .001).
  • Bone mineral density was significantly higher in HA groups (67.01 ± 0.38 mgHA/cm³ ) than PBA groups (64.66 ± 0.85 mgHA/cm³, p < .001).
  • Septic HA groups exhibited greater mineralization than aseptic HA groups, indicating efficacy in infected conditions (p = .016).

Conclusions:

  • Porous hydroxyapatite scaffolds are a viable alternative to bone autografts for critical-sized bone defects.
  • HA scaffolds promote significant bone mineralization and quality, outperforming autografts.
  • The HA scaffold demonstrates potential for treating bone defects, including those with infectious complications.