this invention relates to implantable porous prostheses for use as bone or hard tissue replacements anywhere in the body . the porous implants comprise loose , individual polymeric particles of a specified size , coated with a hydrophilic material and barium sulfate particles . the prostheses are biologically compatible in the body and promote bone and tissue ingrowth and attachment . this invention also relates to a method for producing the novel prosthetic devices disclosed herein .