[en] In motion capture, a standard procedure to obtain the bone motion is the use of skin markers. However, because of the relative motion of the skin and the bones, so-called soft tissue artefacts (STA), the recorded motion does not accurately describe the movement of the bones. To compute joint reaction forces and perhaps limit STA, most musculo-skeletal models use underlying joint models. The knee is usually modeled as a simple hinge joint. However such approaches do not lead to a better estimation of the real motion1. In this work the hinge joint is improved by taking into account the morphological features of the joint surfaces.