Analyzing non-conforming anatomical and prosthetic joints in the AnyBody Modeling System

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(Michael Skipper Andersen, 04. April, 2011 )

Most musculoskeletal models presume idealized joints, such as a revolute joint for the knee and a spherical joint for the hips. However, several anatomical and prosthetic joints are non-conforming to such an extent that the forces significantly influence the detailed joint kinematics and the joint-s internal force equilibrium. This is the case for joints such as spinal disks, knees and many shoulders.
For instance, in the knee, the internal motions are governed by a complex interaction between the muscle actions, cartilage contact mechanics, ligament forces and soft tissue deformations. Capturing all these effects in a realistic model using only kinematic constraints is very difficult, if not impossible.
In this webcast, we demonstrate a novel method called Force-dependent Kinematics (FDK) implemented in the AnyBody Modeling System version 5.0. This method allows motions in user-defined degree-of-freedom to be resolved through force equilibrium, rather than by kinematic constraints, while still enabling computation of the muscle and reaction forces. We take a hands-on approach and perform a live demonstration of how to use FDK for model development.

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