Comparison of the uncemented and cemented Oxford unicompartmental knee prosthesis

The unicompartmental knee prosthesis is a proven treatment for patients with
medial gonartrosis. Knee prosthesis are traditionally fixed with bone cement.
However cementing takes 10-20 minutes additional operation time, waste cement
can be left in the joint space and bone cement can in time become brittle.
Therefore uncemented fixation methods have been develop which might improve
the long term survival.

The goal of this study is to compare the initial and long term clinical results
and survival of the uncemented and cemented Oxford knee prosthesis.
- Does the fixation method affect the knee pain?
- Are the radiological criteria for success used for the cemented Oxford
prosthesis also true for uncemented fixation.
- Are the middle and long term clinical results of the uncemented Oxford at
least as good as for the cemented Oxford?
- Does the uncemented fixation improves the long term survival?

Prospective randomized multi center study

Placement of an Oxford hemi knee prosthesis, for the study group the uncemented
version and for the control group the cemented version.

All patients have the standard risk for an unicompartmental knee prosthesis.
The clinical results if the uncemented Oxford knee are unknown, however they
are expected to be equal to the cemented Oxford. The uncemented Oxford is
expected to give a better recovery and longer survival, however they might give
early loosening because of insufficient early fixation. The patient will obtain
the traditional rehabilitation protocol, during the standard outpatient visits
additional questionnaires concerning function and pain will be taken.