In vivo hydroxyapatite scaffold performance in infected bone defects.
Joseph J Pearson1,2, Nicholas Gerken2,3, Chunsik Bae4
1Department of Biomedical Engineering, The University of Texas at San Antonio, San Antonio, Texas.
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.
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.
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