A method of forming a scaffold is disclosed herein. In someembodiments, a method of forming a scaffold includes dissolvinga polymer in a solvent to form a polymer solution； addingadditive precipitating agent to the polymer solution；precipitating and expanding the polymer from the polymersolution to form a scaffold； and removing the solvent from thescaffold. In some embodiments, prior to adding the precipitatingagent, the method further comprising adding at least one ofcalcium phosphate or a bioactive additive to the polymersolution to form a mixture including the polymer solution andthe at least one of calcium phosphate or bioactive additive.
