IHA are drawn with a length of 2 cm. Dots are data samples from the surfaces of humerus, ulna and radius. 2 Typical example for IHA calculations for forearm pronation, represented in the measurement co-ordinate system. The X-Z plane roughly corresponds with the frontal plane. IHA are drawn with a length of 2 cm.
Dots are data samples from the surfaces of humerus, ulna and radius.
Analogous to the position vector, the optimal direction vector v opt wascalculated as the vector with the smallest angle between axes. In this position, the elbow flexion angle is zero. Data are given in Cm and are expressed in their local Ulnar Co-Ordinate Systems. The data are plotted in the measuring co-ordinate system. IHA calculations showed fluctuations in position, but not as much in orientation.