Abstract
Purpose
Porous tantalum (PT) has been widely used in orthopaedic applications for low modulus of elasticity, excellent biocompatibility, and the microstructures similar to cancellous bone. In order to improve the biological activity of PT, biologically active factors can be combined with the material. The purpose of this study was to investigate if bone morphogenetic protein 7 (BMP-7) modifications could enhance the repairing of cartilage of PT in osteochondral defect in medial femoral condyle of rabbits.
Methods
A cylindrical osteochondral defect model was created on the animal medial femoral condyle of and filled as follows: PT modified with BMP-7 for MPT group, non-modified PT for the PT group, while no implants were used for the blank group. The regenerated osteochondral tissue was assessed and analyzed by histological observations at four, eight and 16 weeks post-operation and evaluated in an independent and blinded manner by five different observers using a histological score. Osteochondral and subchondral bone defect repair was assessed by micro-CT scan at 16 weeks post-operation, while the biomechanical test was performed at 16 weeks post-operation.
Results
Briefly, higher overall histological score was observed in the MPT group compared to PT group. Furthermore, more new osteochondral tissue and bone formed at the interface and inside the inner pores of scaffolds of the MPT group compared to PT group. Additionally, the micro-CT data suggested that the new bone volume fractions and the quantity and quality of trabecular bone, as well as the maximum release force of the bone, were higher in the MPT group compared to PT group.
Conclusions
We demonstrated that the applied modified PT with BMP-7 promotes excellent subchondral bone regeneration and may serve as a novel approach for osteochondral defects repair.
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Acknowledgements
We thank Dr. Jun Wang from Xijing Hosipital affiliated, Fourth Military Medical University of China for technical help in micro-CT.
Funding
This study was funded by the National Key Technology Support Program of China (Contract Grant No. 2012BAE06B03).
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All procedures performed in this study involving animals were in accordance with the ethical standards of the institution at which the study was conducted.
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The authors declare that they have no conflict of interest.
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Wang, Q., Zhang, H., Gan, H. et al. Application of combined porous tantalum scaffolds loaded with bone morphogenetic protein 7 to repair of osteochondral defect in rabbits*. International Orthopaedics (SICOT) 42, 1437–1448 (2018). https://doi.org/10.1007/s00264-018-3800-7
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DOI: https://doi.org/10.1007/s00264-018-3800-7