VIDEOGRAPHIC DETERMINATION OF INSTANTANEOUS CENTER OF ROTATION USING A HINGE JOINT MODEL

There are many 2-dimensional and 3-dimensional kinematic measuring systems available on the commercial market for studying and analyzing human movement. Although each system gathers data by use of different technologies, the systems use similar mathematical methods to generate 2- or 3-dimensional coordinates of surface markers reconstructed from a spatial calibration of multiple planar views. The reconstructed marker coordinates are the basis for deriving kinematic parameters of displacement, velocity, and acceleration used to describe human movement. Because numerous motion analysis systems exist, considerable literature exists addressing the accuracy and application of such systems, primarily in relation to measurement of static or dynamic linear and angular segmental variables applied to studies of human movement. It is possible to assess intrinsic knee joint dysfunction such as ligamentous instability or degenerative pathology by measuring the instantaneous center of rotation (ICR) derived from segmen...