Biomechanical modeling of brace treatment of scoliosis: effects of gravitational loads |
| |
Authors: | Julien Clin Carl-Éric Aubin Stefan Parent Hubert Labelle |
| |
Institution: | 1.Department of Mechanical Engineering,école Polytechnique de Montréal,Montreal,Canada;2.Sainte-Justine University Hospital Center,Montreal,Canada |
| |
Abstract: | The biomechanics of bracing in adolescent idiopathic scoliosis is still not fully understood. Finite element models (FEM)
have been used but the gravity forces were not included and the production of spinal stresses not evaluated. An improved FEM
to simulate brace treatment was thus developed. The 3D geometry of the spine, rib cage, pelvis, and of the trunk external
surface of five scoliotic patients was acquired using a multi-view X-ray technique and surface topography. A FEM of the patient’s
trunk including gravity forces was created. Custom-fit braces were modeled and their installation simulated. Immediate geometrical
corrections and pressures were computed and validated. The resulting compressive loads on the vertebral endplates were quantified.
The influence of the strap tension, spine stiffness, and of the gravity forces was evaluated. Results showed that the brace
biomechanical action was importantly to prevent the scoliotic spine from bending under the gravity forces. The immediate correction
depended on the strap tension and spine stiffness. The distribution and amplitude of computed pressures were similar to those
measured with the real braces. After the brace installation, the coronal asymmetrical compressive loading on the vertebral
endplates was significantly reduced. In conclusion, the model developed presents improvements over previous models and could
be used to better understand and optimize brace treatment. |
| |
Keywords: | |
本文献已被 PubMed SpringerLink 等数据库收录! |
|