Fig. 1

Scaffold characterization; PLGA sponge, and HA gel. A Optical images of the two types of scaffold. B Scanning electron microscopic images of each scaffold (× 200 magnification, scale bar = 200 μm). C Percentage of remaining mass of the scaffolds and D pH changes in scaffolds during in vitro degradation at 37 °C for 28 days (n = 3). E Live and dead staining images before implantation (scale bar = 100 μm)