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A stability-based model of a growing spine with adolescent idiopathic scoliosis: A combination of musculoskeletal and finite element approaches

Kamal, Z ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1016/j.medengphy.2018.12.015
  3. Publisher: Elsevier Ltd , 2019
  4. Abstract:
  5. Using a combined musculoskeletal and finite element (FE) approach, this study aimed to evaluate stability-based muscle forces in a spine with adolescent idiopathic scoliosis (AIS) as compared to a normal spine; and subsequently, determine the effects of stress distribution on the growth plates (GPs) of the growing spine. For this purpose a nonlinear 3D FE model of one normal and one scoliotic thoracolumbar spine, consisting of GPs attached to rigid L1 to L4 vertebrae, were developed using computed tomography images coupled with a growth modulation using the Stokes’ model. Corresponding well with recent in-vivo and in-vitro studies, results of the models predicted intradiscal pressures at the L3-L4 and L4-L5 levels of 0.32 and 0.38 MPa in the normal spine and 0.30 and 0.36 MPa in the scoliotic spine, respectively; and hydrostatic and octahedral shear stresses on the apical GP of 0.11 and 0.06 MPa, respectively. The reaction moments in the scoliotic model resulted in higher compression on the posteroconcave side of the GPs, which led to deformity progression as predicted by the Hueter–Volkmann theory. Moreover, the augmented baseline growth in the Stokes’ model magnified both the scoliotic spine height and Cobb angle growth rates. The presented stability-based approach can be used to predict the performance of rehabilitation strategies in the clinical management of AIS. © 2019
  6. Keywords:
  7. Adolescent idiopathic scoliosis ; Finite element analysis ; Growth modulation ; Musculoskeletal model ; Spine stability ; Computerized tomography ; Modulation ; Musculoskeletal system ; Shear stress ; Stability ; Computed tomography images ; Finite-element approach ; Octahedral shear stress ; Rehabilitation strategy ; Finite element method ; Bone radiography ; Cobb angle ; Computer assisted radiography ; Computer assisted tomography ; First lumbar vertebra ; Fourth lumbar vertebra ; Gravity ; Growth rate ; Human ; Hydrostatic pressure ; Image analysis ; Mathematical model ; Muscle strength ; Muscle stress ; Priority journal ; Shear stress ; Stokes model ; Biological model ; Child ; Growth, development and aging ; Muscle ; Pathophysiology ; Child ; Humans ; Models, Biological ; Muscles ; Scoliosis ; Spine
  8. Source: Medical Engineering and Physics ; Volume 64 , 2019 , Pages 46-55 ; 13504533 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S1350453319300025