Cemented anchorage is currently by far the most frequently selected option for knee prostheses and yields excellent results. Moreover, when the quality of the bone is poor, e.g. due to osteoporosis, there is no alternative to cemented anchorage.
The cement is a special bone cement usually based on plastic. Two separate components are mixed immediately before the mixture is applied to the implant. The cement cures very quickly and thus creates a solid connection between the bone and the prosthesis.
The bone cement is highly biocompatible and can, if necessary, be enriched with antibiotics to prevent infections.
With cement-free fixation, the initial anchorage of the implant is achieved by wedging it into the bone. The implants additionally have a special coating onto which the bone can subsequently grow, thus ensuring stable long-term anchorage.
This method is used mainly for the anchorage of the femoral implant and only rarely for the anchorage of the tibial implant.