Bone cement--porous coated or hydroxylapatite coated prosthesis in total knee arthroplasty--state of the art--future trends.

1. Cementation in total knees is here to stay. 2. Future improvements will lie in the area of implant interfaces--in the near term by improving our polyethylene. 3. Cementless knees, with or without HA, may be indicated in the young, more active patient and where economic concerns have no impact on prosthetic selection.