In the control group new bone formed at extremities and grew into the material at 12 weeks but the volume of material did not reduced obviously.
对照组12周时骨端新骨形成，长入材料，但材料体积无明显减少。
In the control group new bone formed at extremities and grew into the material at 12 weeks but the volume of material did not reduced obviously.
对照组12周时骨端新骨形成，长入材料，但材料体积无明显减少。
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