The general aim of this work has been the development of a knowledge-based technique for half-automated segmentation of digitised radiographs of the wrist, with special emphasis on the carpometacarpal {(CMC)} joint of the thumb. For this purpose "active contours" are used, which are models for automatic detection and quantitative reconstruction of objects from images. It is shown that such models may be effectively used for our purpose especially in combination with knowledge of the anatomy of the hand.
