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. 2019 Aug 1;20(15):3761. doi: 10.3390/ijms20153761

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) In the PEO-coated Mg-Ca-Zn alloy pin, there was rare gas formation (scale bar: 1 mm). (B) Magnification of Figure 3A. The pin had an irregular surface, but tight bone integration formed over the pin surface. In addition, the growth plate adjacent to the pin showed mild hypertrophy and maintained orderly chondrocyte arrangement (scale bar: 200 μm). (C) In the non-coated Mg-Ca-Zn alloy pin, a large amount of gas formed (scale bar: 1 mm). (D) Magnification of Figure 3B. The pin surface was severely degraded compared to that of the PEO-coated group. The growth plate against the pin had orderly chondrocyte arrangement. Thickness of bone integration was shallower than that in the PEO-coated group (scale bar: 200 μm).