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Feasibility of compressive follower load on spine in a simplified dynamic state: A simulation study

Issue title: Frontiers in Biomedical Engineering and Biotechnology – Proceedings of the 3rd International Conference on Biomedical Engineering and Biotechnology, 25–28 September 2014, Beijing, China

Article type: Research Article

Authors: Kim, Byeong Sam; | Lim, Tae-Hong | Kwon, Tae Kyu | Han, Kap-Soo; ;

Affiliations: Humanetics Innovative Solutions Inc., Plymouth, Michigan, USA | Department of Biomedical Engineering, The University of Iowa, Iowa City, Iowa, USA | Division of Biomedical Engineering, Chonbuk National University, Jeonju, Republic of Korea | Medical School, Chonbuk National University, Jeonju, Republic of Korea

Note: [] Corresponding author: Kap-Soo Han, Division of Biomedical Engineering, Chonbuk National University, Jeonju, Republic of Korea. Tel.: +82 63 250 2541; Fax: +82 63 250 2311; E-mail: hanks@jbnu.ac.kr.

Keywords: Compressive follower load, muscle forces, finite element model, lumbar Spine, spine biomechanics

DOI: 10.3233/BME-141045

Journal: Bio-Medical Materials and Engineering, vol. 24, no. 6, pp. 2319-2329, 2014

Published: 2014
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Abstract

This study investigated that the spinal MFs can create compressive follower loads (CFLs) in the lumbar spine in a dynamic state. Three-dimensional optimization and finite element (FE) models of the spinal system were developed and validated using reported experimental data. An optimization analysis was performed to determine the MFs that create CFLs in the lumbar spine in various sagittal postures from 10° extension to 40° flexion. Optimization solutions for the MFs, CFLs, and follower load path (FLP) location were feasible for all studied postures. The FE predictions demonstrated that MFs which created CFLs along the base spinal curve connecting the geometrical centers or along a curve in its vicinity (within anterior or posterior shift by 2 mm) produced stable deformation of the lumbar spine in the neutral standing and flexed postures, whereas the MFs which created the smallest CFLs resulted in unstable deformation. For extended postures, however, finding CFLs creating MFs that produce stable deformation of the extended spine was not possible. The results of this study support the hypothesis that the spinal muscles may stabilize the spine via the CFL mechanism.

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