Scorpio PS vs Scorpio NRG PS total knee arthroplasty. Comparative investigation of function

Knee prostheses consist of several different kinds of design developed to
optimize a certain part of the function of the knee. standard knee prosthesis
consists of a femoral component a tibial component and an insert in between
these two to make movement as smooth as possible.
Dependent on the design of the several parts of a prosthesis the main aim can
be optimising total flexion, better possibility to kneel, or numerous other
specific functions.
The NRG knee prosthesis as a specific design developed to optimize maximum
flexion en decrease post-operative anterior knee pain

This new developed knee prosthesis will be compared to the standard scorpio PS
knee prosthesis. In this comparison it will be examined if the changes in
design really do improve function and deminish pain. Allso patella tracking and
patella tilting will be copared

It is a prospective single center single blind randomized clinical trial. After
pre-operative screening and X-rays 88 patients of the AZM will have a normal
total knee replacement operation. 44 patients will get the scorpio NRG knee
prosthesis and 44 patients will get the Scorpio PS knee prosthesis.
Post-operatively the patients will have a check up at 6 wkeeks 3 months 6
months 1 year 2 years and 5 years. At these check ups a knee society score, a
chair raise and stair climb test will be done, complications will be
registered, a womac patient self evaluation will be done and X-rays will be
taken.

All patients will have a total knee replacement operation during which the
study knee or the control knee prosthesis will be implanted.

The risks for the patients are the standard risks of a total knee replacement
surgery. A surgery which the patient also will have if he/she does not
participate in the study.
At each visit two extra X-rays will be taken of which the radiation exposure
will be largely beneath the allowed exposure.