Med Biol Eng Comput - Finite element analysis of the influence of loading rate on a model of the full lumbar spine under dynamic loading conditions.

Tópicos

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Resumo

Despite an increase in the number of experimental and numerical studies dedicated to spinal trauma, the influence of the rate of loading or displacement on lumbar spine injuries remains unclear. In the present work, we developed a bio-realistic finite element model (FEM) of the lumbar spine using a comprehensive geometrical representation of spinal components and material laws that include strain rate dependency, bone fracture, and ligament failure. The FEM was validated against published experimental data and used to compare the initiation sites of spinal injuries under low (LD) and high (HD) dynamic compression, flexion, extension, anterior shear, and posterior shear. Simulations resulted in force-displacement and moment-angular rotation curves well within experimental corridors, with the exception of LD flexion where angular stiffness was higher than experimental values. Such a discrepancy is attributed to the initial toe-region of the ligaments not being included in the material law used in the study. Spinal injuries were observed at different initiation sites under LD and HD loading conditions, except under shear loads. These findings suggest that the strain rate dependent behavior of spinal components plays a significant role in load-sharing and failure mechanisms of the spine under different loading conditions.

Resumo Limpo

despit increas number experiment numer studi dedic spinal trauma influenc rate load displac lumbar spine injuri remain unclear present work develop biorealist finit element model fem lumbar spine use comprehens geometr represent spinal compon materi law includ strain rate depend bone fractur ligament failur fem valid publish experiment data use compar initi site spinal injuri low ld high hd dynam compress flexion extens anterior shear posterior shear simul result forcedisplac momentangular rotat curv well within experiment corridor except ld flexion angular stiff higher experiment valu discrep attribut initi toeregion ligament includ materi law use studi spinal injuri observ differ initi site ld hd load condit except shear load find suggest strain rate depend behavior spinal compon play signific role loadshar failur mechan spine differ load condit

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