Análise fotoelástica da regi？o inferior do corpo vertebral L4

objective: to analyze the shear forces on the vertebral body l4 when submitted to a compression force by means of transmission photoelasticity. methods: twelve photoelastic models were divided into three groups, with four models per group, according to the positioning of the sagittal section vertebrae l4-l5 (sections a, b and c). the simulation was performed using a 15n compression force, and the fringe orders were evaluated in the vertebral body l4 by the tardy compensation method. results: photoelastic analysis showed, in general, a homogeneous distribution in the vertebral bodies. the shear forces were higher in section c than b, and higher in b than a. conclusion: the posterior area of l4, mainly in section c, showed higher shear concentrations, corresponding to a more susceptible area for bone fracture and spondylolisthesis. economic and decision analyses - development of an economic or decision model. level i