Abstract
Recently, chronic osteomyelitis is still a challenging surgical problem. Unfortunately, the traditional clinical method using bone cement loaded antibiotics is restricted due to its non-biodegradability and limited release of antibiotics. Hydroxyapatite is a good adsorbent with good biocompatibility, an ideal bone repair material, and can avert the requirement for the secondary surgical procedure of removal. In this study, nano-hydroxyapatite combined with a polyurethane containing 3% silver (Ag/n-HA/PU) was synthesized, and investigated for its efficacy of treating chronic bone infection with bone defects. To clarify its silver ions release characteristics, the concentration of the Ag+ in the elution was analyzed every day after in vitro deionized water immersion. A chronic osteomyelitis of tibia in rabbit model was established, and 70 New Zealand rabbits were divided into 4 groups, including the blank control group, nano-hydroxyapatite combined with polyurethane (n-HA/PU) implant group, 3% Ag/n-HA/PU group and 10% Ag/n-HA/PU group after debridement. Routine blood tests, radiography, Micro-CT, and histological staining were conducted at 4 days, 3, 6 and 12 weeks post-treatment. The results showed that the released silver from the 3% Ag/n-HA/PU and 10% Ag/n-HA/PU exhibited an initial burst release and followed by a slow controlled release up to 39 days and 42 days respectively. A good repair of bone defects, an appropriate rate of degradation of scaffolds and no significant toxicity were observed in the 3% Ag/n-HA/PU group, indicating the advantages of this novel synthetic scaffold to be a potential option for the treatment of chronic osteomyelitis.
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Acknowledgements
The authors thank Mian Tian (from Department of orthopedic Surgery, The First Affiliated Hospital of Chongqing Medical University) for his help on surgical procedure. They are also grateful to the Infectious Disease Laboratory of The First Affiliated Hospital of Chongqing Medical University for donating bacterial strains.
Funding
This work was supported by the National High Technology Research and Development Program of China (863 Program, 2013AA032203) and the Social Undertakings and Livelihood Security Scientific and Technological Innovation Project of Chongqing China (cstc2017shmsA130022).
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The study was approved by the animal experiment ethic committee of The First Affiliated Hospital of Chongqing Medical University.
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Zhang, D., Liu, W., Wu, XD. et al. Efficacy of novel nano-hydroxyapatite/polyurethane composite scaffolds with silver phosphate particles in chronic osteomyelitis. J Mater Sci: Mater Med 30, 59 (2019). https://doi.org/10.1007/s10856-019-6261-7
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DOI: https://doi.org/10.1007/s10856-019-6261-7