On an estimation of the location of the axes of wrist joint movements

The relation between the muscular force of the electrically stimulated muscle and the moment of a joint in vivo, is not understood clearly yet. This is a problem for the Functional Electrical Stimulation (FES) to create a useful movement. For this reason, it is important to estimate the location of the joint axes also for kinematic studies. This type of study has been carried out with a cadaver specimen. In many cases. 2 kinds of motion of the wrist joint (radial-ulnar deviation and flexion-extension) in vivo were measured with a magnetic tracking device, which was used to estimate the location of helical axes along a motion of wrist joint. Here we propose a basic parameter for the skeletal model of the wrist.<>