Analysis of Functional Scoliosis by Means of an Anisotropic Beam Model of the Human Spine

Author:

Lindbeck L.1

Affiliation:

1. Royal Institute of Technology, Department of Mechanics, S-100 44 Stockholm, Sweden

Abstract

An upright, muscle-relaxed human spine, suffering from a mild functional scoliosis, caused by a small difference in leg length, is modeled as an anisotropic, elastic beam. The lower end of the beam is built-in in a fixed body, i.e., the laterally tilted pelvis. The upper end is rigidly attached to a rigid body, i.e., the supported upper part of the trunk, which is supposed to move freely in the frontal plane. It is shown that the characteristic scoliotic curvature of the spine, observed on an X-ray picture, can be reproduced by means of buckling analysis of the beam model, using realistic values of geometric and loading parameters and a properly chosen bending stiffness, which is found to be in reasonable agreement with earlier experimental findings. The analysis also shows that the muscle-relaxed upright equilibrium position of the spine is mechanically unstable.

Publisher

ASME International

Subject

Physiology (medical),Biomedical Engineering

Cited by 9 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Determination of the stiffness of the equine cervical spine;The Veterinary Journal;2010-12

2. Idiopathic scoliosis: biomechanics and biology;European Spine Journal;1996-12

3. Euler buckling as a model for the curvature and flexion of the human lumbar spine;Proceedings of the Royal Society of London. Series B: Biological Sciences;1996-10-22

4. Asymmetrical loads and lateral bending of the human spine;Medical & Biological Engineering & Computing;1993-07

5. Euler stability of the human ligamentous lumbar spine. Part I: Theory;Clinical Biomechanics;1992-02

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