Fig. (4) Radiographic images at 10 days and 4 weeks, and macroscopic findings at 4 weeks post-surgery. (A), (B), (C) Images of control group. (D), (E), (F) Images of collagen hydrogel scaffold group. (G), (H), (I) Images of FGF2-loaded collagen hydrogel scaffold group. Ctrl, Col and FGF indicate control, collagen hydrogel scaffold, and FGF2-loaded collagen hydrogel scaffold, respectively. (Scale bars represent 5 mm).

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