The finite element based human model can simulate the deformation of the musculoskeletal system and soft tissue of the human body and is mainly used for local human model. However, the finite element human body model does not simulate the force and shape of muscles that actively change over time, and has a disadvantage in that a finite element model that is suitable for the purpose of the analysis must be newly generated. For several reasons, biomechanical studies on the human body in motion using finite element methods have been limited.

The purpose of this study is to study the physical reactions that occur in the intervertebral disc of the human body during motion by using the OsimToABQ program of the previous study linking the rigid body dynamics-based human model with the finite element-based human model. Using osimtoabq, it is possible to automatically generate a finite element model that considers changes of posture and position of muscle over time. In particular, we would like to suggest a new biomechanical evaluation of the movements such as bending posture and lifting tasks that are still controversial by combining rigid body models with finite element models.

Motion capture experiments and motion analysis were performed for upright posture, flexion bending, lateral bending, stoop lifting, and squat lifting. To analyze the response of the lumbar spine, we modeled the detailed finite element model of the intervertebral disc that describes the mechanical behavior of the intervertebral disc in detail. The OsimToABQ program developed in the previous study was applied to analyze the detailed finite element model of the lumbar spine. As a result, the pressure and deformation in the intervertebral disc during the operation were analyzed by the finite element method.