At 4 weeks postoperatively, five rats from each group were killed and the sample harvested in preparation for the radiographic and histological studies. Bone samples were examined with a μCT-100 scanner (Scanco Medical, Switzerland) with a resolution of 24 μm and analyzed using the accompanying supporting analysis and three-dimentional imaging software to evaluate callus formation. The bone volume fraction (BV/TV) and the trabecular thickness (Tb.Th) were calculated by standard three-dimensional microstructural analysis [25 (link), 26 (link)].
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