Preliminary experience with a total knee prosthesis with porous coating used without cement.

Preliminary results of implanting a total knee prosthesis with a porous coating without cement in 41 patients (46 knees) followed up for four to 25 months have shown no clinical interface failures. Radiographs show that intimate contact between bone and prosthesis is maintained for as long as two years. Instrumentation is particularly critical to cementless application but also important to all total knee arthroplasties. Prosthetic design may also be critical for cementless operations. An anatomic, minimally constrained resurfacing design has been shown to be successful in the short term and justifies continuation of clinical investigation of cementless total knee arthroplasty.