Abstract: A new method for acquisition and computer elaboration of joint anatomy and motion is provided. The method uses a commercial electrogoniometer and a software for numerical interpolations and interactive display of the anatomical structures during the joint motion. The acquisition protocol and the computer elaboration are easy to execute. Geometrical and functional analysis of the knee are possible. In particular it is possible to reproduce in a controllable and measurable environment the real joint, and to quantify both anatomical and functional features, as well as the correlation to each other. Moreover, tracking anatomical structures is achieved during motion, with numerical and statistical evaluation of adjacent sections and orientations comprising bone, ligaments insertions and interpolated points such as FF centers.