Tough magnesium phosphate-based 3D-printed implants induce bone regeneration in an equine defect model.
- Journal Article
- Research Support
- Non-U.S. Gov't
Summary
The research article presents a study on magnesium phosphate-based 3D-printed implants, which have been modified with strontium and polycaprolactone, and their capacity to induce bone regeneration, thus showing promise for usage in the treatment of complex and large bone defects.
Research Details and Methodology
In their experiment, the researchers addressed a significant challenge in bone tissue engineering: the necessity for bone substitutes that degrade over time while retaining biological and mechanical functionality, especially in larger, load-bearing bone defects. To achieve this, a novel material was developed:
- Magnesium phosphate (MgP) ceramics were modified with strontium (Sr) ions, which have been previously noted for their ability to promote bone growth. A biodegradable polymer called polycaprolactone (PCL) was also added to the mixture. The combination material with 30% PCL (referred to as MgPSr-PCL30) was then 3D printed into implant structures.
Results of the 3D Printing Process
The MgPSr-PCL30 material turned out promising due to several factors:
- The material allowed for the production of large implant structures at room temperature, while maintaining internal macroporosity of about 40%.
- The resulting implants showed impressive mechanical strength, enduring extensive loading without deformation.
- This 3D printed scaffolds could promote bone formation in vitro, even without the input of osteo-inducing components typically required for bone growth.
In Vivo Performance
To assess the viability of these new implants, they were tested in a long-term in vivo model:
- A 6-month study was performed in an equine model, specifically an equine tuber coxae, that is a part of a horse’s hip bone.
- Micro-CT and histological analyses were utilized to monitor bone growth and reaction to the implant over time.
- Results showed that these implants were not only compatible with the biological environment, but also successfully induced bone regeneration, unlike empty defects which didn’t cause any bone formation.
Overall Implications
The study has significant implications for bone tissue engineering:
- The research presents a promising new direction for the production of bone substitutes, particularly those for larger, complex, and load-bearing bone defects, as the MgP-based ceramics significantly improved load-bearing and shaping properties.
- This 3D printing process also represents a possible means of simplifying the production process for bone implants.
- The successful in vivo study implies that strontium-modified, MgP-based implants may be viable for further investigation and potential human application in the future.
Cite This Article
Publication
Researcher Affiliations
- Department of Orthopedics, University Medical Center Utrecht, GA, Utrecht, the Netherlands; Regenerative Medicine Utrecht, Utrecht, the Netherlands.
- Department for Functional Materials in Medicine and Dentistry, University of Wurzburg, Germany.
- Department of Orthopedics, University Medical Center Utrecht, GA, Utrecht, the Netherlands; Regenerative Medicine Utrecht, Utrecht, the Netherlands.
- Department of Equine Sciences, Faculty of Veterinary Sciences, Utrecht University, the Netherlands.
- Technical University of Denmark, Department of Health Technology, 2800 Kgs, Lyngby, Denmark.
- Technical University of Denmark, Department of Health Technology, Center for Intestinal Absorption and Transport of Biopharmaceuticals, 2800 Kgs, Lyngby, Denmark; Department of Regenerative Biomaterials, Radboud University Medical Center, Philips van Leydenlaan 25, Nijmegen, 6525 EX, the Netherlands.
- Department for Functional Materials in Medicine and Dentistry, University of Wurzburg, Germany.
- Department of Equine Sciences, Faculty of Veterinary Sciences, Utrecht University, the Netherlands.
- Department of Orthopedics, University Medical Center Utrecht, GA, Utrecht, the Netherlands; Regenerative Medicine Utrecht, Utrecht, the Netherlands; Orthopedic Biomechanics, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, the Netherlands. Electronic address: M.DiasCastilho@umcutrecht.nl.
- Department of Orthopedics, University Medical Center Utrecht, GA, Utrecht, the Netherlands; Regenerative Medicine Utrecht, Utrecht, the Netherlands; Department of Equine Sciences, Faculty of Veterinary Sciences, Utrecht University, the Netherlands.
MeSH Terms
- Animals
- Bone Regeneration
- Horses
- Magnesium Compounds
- Phosphates
- Porosity
- Printing, Three-Dimensional
- Tissue Engineering
- Tissue Scaffolds
Grant Funding
- 647426 / European Research Council
Conflict of Interest Statement
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