Evaluation of the forces on the lumbar intervertebral discs (IVDs) is critically important since it closely relates to biomechanics, pathology, prosthesis design and tissue engineering. It remains a big challenge to noninvasively predict the in vivo forces on the IVD. Using our previously established dual fluoroscopic imaging system (DFIS) [1], motion of the vertebrae can be accurately obtained. We proposed to use the kinematics from DFIS as inputs into FE model to calculate the forces on the IVD. In this study, we validated the technique by testing an IVD on a 6DOF robotic system under applied loads and under DFIS. A subject specific FE model of IVD was built. Forces and moments were predicted and compared to the applied loads.

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