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(A) Three-dimensional images of semitendinosus autograft fixed by the screws to the femoral tunnel in ACL reconstruction (scale bar means 3 mm). (B) Representative 2D micro-CT images of coronal sections of the femoral tunnel with HP Mg and Ti screws at 2, 4 and 12 weeks post-operatively (scale bar means 3 mm). (C) Volume of femoral tunnel in which the HP Mg screws inserted. (D) BIC calculated by micro-CT (**P < 0.01).
