Degradation rates and morphology changes of the PLGA scaffolds in PBS solution during 7 weeks were shown in Fig. 8. As time passed, the weight of the scaffold had been reduced (see Fig. 8(a)). The degradation rate of the scaffold is shown about 16 % weight loss after 5 weeks, but morphology of the scaffold was maintained. The collapse of the scaffold occurred after 6 weeks passed (see Fig. 8(b)).Fig. 8Degradation of control specimens in PBS solution during 7 weeks (a) Degradation rate and (b) morphology change