Approaches to the interface problem in total joint arthroplasty

Bone shape and composition and the configurations and interface conditions of implant components influence the stability of the joint in various ways. A stable interface depends on overall stress and microstress distribution on the bone, particularly trabecular bone. Pressure pattern studies illustrated the effect of tibial component design on overall pressure distribution. Experiments in knee joints of sheep showed that a velour layer interposed between a metallic implant and bone induces fibrous ingrowth. It was proposed that this situation could reduce peak microstresses in trabecular bone.