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(A) Immunofluorescence showing colocalization of M1 (CD11b) and M2 (arg 1) macrophages at the tendon–bone interface of HP Mg group and Ti group at 2, 4 and 12 weeks after ACL reconstruction (scale bar means 150 μm). (B) Quantitation of macrophages expressing M1 and M2 markers determined by proportional area staining for CD11b (M1 macrophages) and Arg1 (M2 macrophages) at the tendon–bone interface (*P < 0.05, **P < 0.01).
