This work was supported by grants from the National Natural Science Foundation of China (No.81271954,No.81102604),Shanghai Science and Technology Program (No.12QH1402700),and the National Basic Research Program of China (No.2009CB930000).
Background Bone grafting is commonly used to repair bone defects.As the porosity of the graft scaffold increases,bone formation increases,but the strength decreases.Early attempts to engineer materials were not able t...