Joint Modeling
Up ] Point Modeling ] Segment Modeling ] Segment Group Modeling ] [ Joint Modeling ]


Joint modeling is required for the computation of the joint torques. See the Joint Kinetics section for the details of the procedures to compute the joint torques. In Kwon3D, a joint can have the following properties:

Joint: the joint point defined as a secondary point in point modeling
Proximal segment: the proximal segment forming the joint
Distal segment: the distal segment forming the joint
Ground reaction force info: GRF acting on the distal segment
Additional external force info: additional external force and torque acting on the distal segment

Note here that one has to define the most distal joint first due to the nature of the inverse dynamics procedure. For example, the lower extremity joints must be defined in the order of ankle -> knee -> hip. The info about the GRF and additional external force on the distal segment is optional. To use the GRF data in the inverse dynamics procedure, one has to import the ground reaction and free torque data into the Kwon3D trial from the matching KwonGRF trial. At least a common event needs to be defined in both Kwon3D trial and the KwonGRF trial for the data sync.

The joint torques and the net joint forces can later be transformed to the local reference frames for a more in-depth data interpretation.


Young-Hoo Kwon, 1998-