Surface analysis of posterior stabilized femoral components used in total knee arthroplasty

The purpose of this study was to evaluate the preimplantation surface finish of the femoral component used in total knee arthroplasty. Nine femoral components from various manufacturers were obtained for analysis. All were fixed-bearing, posterior-stabilized implants intended for cemented arthroplasty. Surface characterization involved light profilometry over multiple surface points from the condylar surface, trochlear groove, and the posterior stabilizing cam. Results revealed that the condylar surface roughness was not significantly different when comparing designs with a mean roughness average ranging from 43.6 to 116 nm. The trochlear surface was generally similar to that of the condyles in most implants, although significant differences were seen in 2 implants (P <.05). Of note, the articular surface of the stabilizing cam was uniformly rougher than the condylar surface in all implants and significantly rougher (P <.05) in 6 of the 9 components.