Dealing with endoprostheses requires the utmost care in production. Only very special 3D measuring systems are able to measure the surfaces with the required precision. To be successful distance sensors have to be moved very precisely, so that reliable measurements from freeform surfaces Chromatic confocal sensors are well suited to data acquisition as the high apertures ensure that even with highly inclined or highly reflective surfaces sufficient light is returned to the sensor. In most cases, it is the articulating surfaces of joint components that are measured. These are exactly the surfaces that may come in contact with the other surface during the possible movements of a joint. The gliding areas need to fit perfectly. This high surface quality of the contact surfaces of endoprostheses do not only shine, they are highly

reflective, features that often cause competing scanning systems in considerable embarrassment. Non-contact scanning sensors from Precitec Optronik can measure these surfaces even if the slope-angles are very steep Aim is to measure roughness, topography and 3D shape with only one measurement. Manufacturers place a strong emphasis on 3D contour accuracy and surface quality. Artificial joints are known as medical devices of the highest risk category (III) along with heart valves and stents. They require quality assurance procedures which are not an end in itself, but vital: Currently, one out...