MODELO MATEMÃTICO-COMPUTACIONAL CAPAZ DE DESCREVER E SIMULAR A DINÂMICA DA COLUNA LOMBAR HUMANA, COM SOLICITAÇÃO DE ESFORÇO PÓSTERO-ANTERIOR E PRESSÃO ABDOMINAL: ANÃLISE COM RIGIDEZ VISCOELÃSTICA

Abstract

Evaluate a dynamic model of human lumbar spine using the non-linear viscoelastic stiffness. Many of the techniques for the clinical treatment of dysfunction with manipulations acting on the segments of the human spine have been based on the posteroanterior force application (PA). The proposed model is based on a multibody system with seven rigid bodies, thorax, five lumber vertebra and sacrum segments, and six deformable bodies. Periodic oscillatory posteroanterior forces were applied to each vertebra. The influences of parameters for the simulation model were: the initial lordotic curvature, the abdominal pressure and PA forces. The non-linear stiffness introduced in the model affects the stability of anteroposterior movement when the periodic forces are applied to one of the vertebra. The change in abdominal pressure can significantly alter the response of intradiscal movement. The model can predict the acceptable dynamics behavior of human lumbar spine to posteroanterior force application.

Index Terms - Abdominal pressure, human lumbar spine dynamic, nonlinear mathematical model.