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Int. J. Mol. Sci. 2014, 15(2), 2959-2970; doi:10.3390/ijms15022959
Article

Shape and Site Dependent in Vivo Degradation of Mg-Zn Pins in Rabbit Femoral Condyle

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Received: 26 October 2013; in revised form: 2 January 2014 / Accepted: 16 January 2014 / Published: 20 February 2014
(This article belongs to the Special Issue Biodegradable Magnesium Alloys and Implants)
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Abstract: A type of specially designed pin model of Mg-Zn alloy was implanted into the full thickness of lesions of New Zealand rabbits’ femoral condyles. The recovery progress, outer surface healing and in vivo degradation were characterized by various methods including radiographs, Micro-CT scan with surface rendering, SEM (scanning electron microscope) with EDX (Energy Dispersive X-ray analysis) and so on. The in vivo results suggested that a few but not sufficient bridges for holding force were formed between the bone and the implant if there was a preexisting gap between them. The rapid degradation of the implantation in the condyle would result in the appearance of cavities. Morphological evaluation of the specially designed pins indicated that the cusp was the most vulnerable part during degradation. Furthermore, different implantation sites with distinct components and biological functions can lead to different degradation rates of Mg-Zn alloy. The rate of Mg-Zn alloy decreases in the following order: implantation into soft tissue, less trabecular bone, more trabecular bone, and cortical bone. Because of the complexities of in vivo degradation, it is necessary for the design of biomedical Mg-Zn devices to take into consideration the implantation sites used in clinics.
Keywords: magnesium alloy; shape dependent; site dependent; in vivo degradation magnesium alloy; shape dependent; site dependent; in vivo degradation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Han, P.; Tan, M.; Zhang, S.; Ji, W.; Li, J.; Zhang, X.; Zhao, C.; Zheng, Y.; Chai, Y. Shape and Site Dependent in Vivo Degradation of Mg-Zn Pins in Rabbit Femoral Condyle. Int. J. Mol. Sci. 2014, 15, 2959-2970.

AMA Style

Han P, Tan M, Zhang S, Ji W, Li J, Zhang X, Zhao C, Zheng Y, Chai Y. Shape and Site Dependent in Vivo Degradation of Mg-Zn Pins in Rabbit Femoral Condyle. International Journal of Molecular Sciences. 2014; 15(2):2959-2970.

Chicago/Turabian Style

Han, Pei; Tan, Moyan; Zhang, Shaoxiang; Ji, Weiping; Li, Jianan; Zhang, Xiaonong; Zhao, Changli; Zheng, Yufeng; Chai, Yimin. 2014. "Shape and Site Dependent in Vivo Degradation of Mg-Zn Pins in Rabbit Femoral Condyle." Int. J. Mol. Sci. 15, no. 2: 2959-2970.


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