Abstract:

BACKGROUND: The finite element analysis of partial vertebral or entire vertebral massage technique has its limitation.
OBJECTIVE: To build an infinite element model of “lumber-pelvic-hip” to research the biomechanical mechanism of lumbar massage.
METHODS: Surface models of the lumbar, pelvis and proximal femur bone complex with high geometric similarity were constructed by Mimics 10.01 through importing subject-specific spiral CT data. Then, the models were modified though geomagic9 software, and solid modeling was converted from triangular based surface model by hypermesh10.0 software to add intervertebral disc and ligaments. According to the relevant literature on the finite element model, material properties were assigned for each component. Three loading conditions were used to simulate lumbar massage technique in finite element analysis software Abaqus6.5 software. Finally, the displacement, von-Misses stress and strains of specific location in the “lumber-pelvic-hip” infinite models were calculated by computer.
RESULTS AND CONCLUSION: The displacement, von Misses stress and strains of specific location in the model under the three conditions could reflect the biomechanical characteristics of the lumber-pelvic-hip, implying the accuracy of the finite element model. Geometric similarity is essential for a finite element model, and subject-specific material assignment according to reported biomechanical data can ensure the accuracy of the model. Both loads and boundary conditions approximation to physiologically environment in the finite element models ensure the accuracy of results.