Clinical performances of ingrowth surfaces.

Since the relatively recent introduction of porous-coated implants for joint replacement applications, considerable experience has been gained concerning the efficacy of these devices. In general, the short- and intermediate-term clinical results have been satisfactory. Based on the authors' experience with retrieved components, bone ingrowth is a consistent finding in well-fixed implants, particularly in areas of rigid fixation and intimate apposition. However, a number of issues have emerged that may jeopardize the long-term success of porous-coated devices. These include femoral component subsidence, porous-surface delamination, endosteal bone loss, and proximal femoral atrophy. Improvements in design, manufacturing processes, and surgical technique can be expected to address some of the current limitations in these implant systems.