The prosthesis-bone interface in total knee arthroplasty.

Abstract

Classic methods of implant component fixation, including the use of screw and impact-tapered, interference-fit stabilization, have provided longevity of function for total knee arthroplasties (TKAs). Optimal cement stabilization may be limited by the degradation characteristics of methyl-methacrylate. Modern application of porous coating for bony ingrowth fixation has not been as successful as expected, particularly as applied to the tibial component in TKA. Based on their in vivo research, the authors have developed a tibial component with an array of porous-coated cones that ensure immediate fixation and a graduated stress field to the host trabecular bone. This may improve the reliability and durability of tibial component fixation.