A knee joint prosthesis assembly can include a femoral component that has a medial and a lateral condyle portion connected by a patellar track portion. The roughened surface reduces light reflections occurring repeatedly inside the LED, and thus extracts more light out of the LED. The first semiconductor chip has a first and second surfaces which are substantially flat in nature. The measuring system contains switches that provide the total absolute value for further processing made up of the absolute value of the segment and the calculated absolute value within the segment. , a CANCAL module of the CAN device.