What are the components of knee replacement implants

Each patient s choice of design and materials for knee replacement prosthesis is unique. Metal is used to make the major implant components, which are commonly titanium or chrome-cobalt alloys. The implants are cemented in place or osseointegrated, which involves a porous metal stem extending into the tibia and the patient s natural bone growing into it A plastic platform or spacer will be introduced between the tibial and femoral implant surfaces. Polyethylene is used to make the spacer.
Metal alloys (cobalt-chromium) or metal-ceramic alloys make up the majority of femoral components (oxidized zirconium). Plastic makes up the patellar component (polyethylene). The tibial implant is similarly made of plastic (polyethylene).