a bioactive pmma bone cement contains a powder component and a reactive monomer liquid , wherein the powder component and the reactive monomer liquid when mixed with one another react with one another and form a polymer - based solid material . the powder component contains particulate polymer powder of polymethylmethacrylates ; a radical starter ; and anionic copolymer nanoparticles . the anionic copolymer nanoparticles are distributed in nano - particulate form within the particulate powder component or coated as a film on particles of the particulate polymer powder .