Knee prosthesis is put in as an artificial knee joint when there is an advanced wear and tear or in case of extreme destruction of joint surface. Due to the individual size and the different internal structure of bone, a surgeon's task is among other things to choose a suitable prosthesis and to find the optimal position for it relatively to the bone. Since a surgeon is not able to try out all prosthesis directly on the patient, they have to be tested virtually by computer simulations. Such algorithms and software packages are developed at the Fraunhofer ITWM together with scientists from Catania (CCC) and Lima-Lto spa (Italy).

A graphical and user-friendly user interface should help the surgeon to realize virtually the operation of bone and the positioning of prosthesis and to test the mechanical strain of the prosthesis-bone system per computer simulation. Such virtual operations can be performed several times with no pain for the patient, in order to make the best decision.