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Three-Dimensional Printed BGS Treat a Large Bone Defect in a Rabbit Model.
Liang Zhao1, Yuming Luo2, Yijun Wang1
1Department of Orthopedic Surgery, the Third Affiliated Hospital, Southern Medical University, Guangzhou, China.
Doklady. Biochemistry and Biophysics
|April 25, 2021
Summary
3D printed bioactive glass porous scaffolds (BGS) effectively promote bone regeneration in large defects. These scaffolds degrade and support new bone formation, showing promising results in rabbit femur models.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Orthopedic Surgery
Background:
- Large bone defects pose significant challenges in orthopedic reconstruction.
- Bioactive glass porous scaffolds (BGS) offer potential for bone tissue engineering.
- 3D printing enables precise fabrication of customized BGS for defect repair.
Purpose of the Study:
- To evaluate the efficacy of 3D printed BGS in reconstructing large bone defects.
- To assess the bone regeneration capacity and degradation profile of BGS in vivo.
Main Methods:
- Creation of 1.0 cm and 1.5 cm segmental femur defects in a rabbit model.
- Implantation of 3D printed BGS matching the defect sizes.
- Evaluation using X-ray imaging, Hematoxylin and Eosin (H&E) staining, and immunohistochemical analysis.
Main Results:
- New bone formation was observed at 4 weeks, with ossification completing by 12 weeks post-implantation in both defect sizes.
- BGS degraded in vivo, forming osteoid-like material and facilitating neo-ossification from the scaffold's edge to its center.
- Osteogenesis-related gene expression (BMP, collagen I, RUNX-2) peaked at 8-18 weeks, depending on defect size and specific gene.
Conclusions:
- 3D printed BGS effectively support and enhance the reconstruction of large bone defects.
- The degradation of BGS promotes osteoid formation and subsequent bone regeneration.
- BGS demonstrate significant potential as a scaffold material for orthopedic bone defect repair.
