Estimation and validation lumbar loads based on OpenSim biomechanical model

• 1、School of Automotive Engineering,,Chongqing University,Chongqing 400030

Abstract：Lumbar biomechanical loads are important to qualify back injury and pain. Due to the defects and hazards of in vivo measurement experiments, biomechanical modeling has become an operative method to assess lumbar loads. In order to measure lumbar loads of the human body in different postures, OpenSim was used to build a full-body model with detailed lumbar spine and 6 degrees of freedom in vertebral joint besides adding an intervertebral mechanical model. By analysing the correlation of L4-L5, L3-L4 joint force, erector spinae muscle force and intervertebral pressure, EMG signal results in postures of body anteflexion, inclination and loading, the correlation coefficients were all bigger than 0.9. In addition, the average error between the simulation value and the literature value after normalizing the L1-L2 joint force is 8.2%, and the average error between the simulation value and the literature value of the L4-L5 joint force is 6.3%. The simulation results consistented significantly with the in vivo experimental measurement results, which indicate that human musculoskeletal model can be available for back loading assessment

Keywords： Human biomechanics Musculoskeletal model Lumbar loads Human comfort