A sterile implantable artificial substitute for a knee joint typically designed to replace all the articulating surfaces of the damaged/degenerative (e.g., arthritic) joint [total knee arthroplasty (TKA)] or to replace a dysfunctional knee prosthesis (revision); it is designed with a mechanism for rotation to minimize wear/loosening problems and to allow greater range of motion for the joint than other types of knee prostheses. It typically includes femoral, tibial, and patellar components that articulate and with parts made of metal, ceramic, and/or polyethylene (PE); it may be implanted with or without bone cement and is often used for younger and/or active patients.