title: [Artificial knee -- plastic abrades metal].
mesh_terms: D001672:Biocompatible Materials / Q000737:chemistry*; D017276:Friction; D007720:Knee Prosthesis; D008670:Metals / Q000737:chemistry*; D010969:Plastics / Q000737:chemistry*; D011475:Prosthesis Failure
chemical_list: D001672:Biocompatible Materials; D008670:Metals; D010969:Plastics