Computertomographic examinations of the hindfoot in the frontal and horizontal view will show us morphological findings, which we could not see with conventional X-ray-technique. Out of these findings we are able to control our operative reconstruction as well as late changes in bone healing. The horizontal view will show us the osseous structures of the talus and calcaneus as well as of the navicular and cuboid bone, as it is necessary for preoperative evaluation of the hindfoot.