A biodegradable nanocomposite and a method of forming a biodegradable nanocomposite are provided. In one aspect, the biodegradable nanocomposite includes a biodegradable polymer and a reinforcing agent substantially dispersed throughout the biodegradable polymer by rapid depressurization of a supercritical fluid. The biodegradable nanocomposite further includes a plurality of pores formed in the nanocomposite, the plurality of pores having an average pore size greater than about 100 μm.