||The wrist is the most common location for long bone fractures in humans. To be able to decide the correct treatment and evaluate the healing process of such fractures, orthopedic surgeons need to measure the fracture displacement, particularly the angulation of the joint surface in relation to the central long axis of the fractured long bone. In this seminar, I will present a semi-automatic or interactive system for performing such measurements in 3D computed tomography images of the wrist. I will give an overview of the underlying measurement methods and describe how stereo graphics, head tracking, 3D input, and haptic feedback can be used to facilitate user interaction in 3D. Finally, I will present the results of a case study in which we compared our system with conventional 2D measurement methods.