How is the knee prosthesis secured?

An artificial knee joint can be secured into the bone in a number of different ways. In essence, there are two main types of fixation – with cement or cementless:

  • If the bone structure lacks stability, the knee joint replacement is secured using bone cement. Immediately after the operation, the knee endoprosthesis and bone are thus securely bonded.
  • If the patient’s bone is of good quality, the artificial knee joint can be secured using a cementless technique. With such methods, the bone slowly grows into the knee endoprosthesis to form a strong joint after some time.

The correct choice therefore not only depends on the patient’s age but also on the nature of the bone. The surgeon decides upon the appropriate method together with the patient during the preoperative discussion.

With this method, the artificial femoral and tibial components are bonded to the bone using bone cement. Bone cement is always used if the back of the kneecap is replaced.

As opposed to cemented fixation, here the artificial femoral and tibial components are wedged into the bone. Consequently, the rough metal surfaces of the prosthesis components are in direct contact with the bone, which gradually grows in.

Hybrid prostheses combine both cemented and cementless fixation methods: the femoral component is placed without cement and the tibial component is cemented.