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Acta Ortopédica Brasileira

Print version ISSN 1413-7852

Abstract

FAKHOURI, Sarah Fakher et al. Photoelastic analisys in the lower region of vertebral body L4. Acta ortop. bras. [online]. 2012, vol.20, n.1, pp.17-20. ISSN 1413-7852.  https://doi.org/10.1590/S1413-78522012000100003.

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

Keywords : Spine; Biomechanis; Tension.

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