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Biomechanical motion simulation and dynamic analysis of human joint momentswill provide insights into Musculoskeletal Disorders. As one of the mainstreamsimulation tools, OpenSim uses proportional scaling to specify model segmentmasses to the simulated subject, which may bring about errors. This study aimsat estimating the errors caused by the specifying method used in OpenSim aswell as the influence of these errors on dynamic analysis. A 3D scan is used toconstruct subject's 3D geometric model, according to which segment masses aredetermined. The determined segment masses data is taken as the yardstick toassess the errors of OpenSim scaled model. Then influence of these errors onthe dynamic calculation is evaluated in the simulation of a motion in which thesubject walks in an ordinary gait. Result shows that the mass error in onesegment can be as large as 5.31\% of overall body weight. The mean influence oncalculated joint moment varies from 0.68\% to 12.68\% in 18 joints. Inconclusion, a careful specification of segment masses will increase theaccuracy of the dynamic simulation. As far as estimating human segment masses,the use of segment volume and density data can be an economical choice apartfrom referring to population mass distribution data.

Using 3D Scan to Determine Human Body Segment Mass in OpenSim Model