A biomechanical model for estimating loads on thoracic and lumbar vertebrae.

Clinical Biomechanics
Sravisht IyerM L Bouxsein

Abstract

Biomechanical models are commonly used to estimate loads on the spine. Current models have focused on understanding the etiology of low back pain and have not included thoracic vertebral levels. Using experimental data on the stiffness of the thoracic spine, ribcage, and sternum, we developed a new quasi-static stiffness-based biomechanical model to calculate loads on the thoracic and lumbar spine during bending or lifting tasks. To assess the sensitivity of the model to our key assumptions, we determined the effect of varying ribcage and sternal stiffness, maximum muscle stress, and objective function on predicted spinal loads. We compared estimates of spinal loading obtained with our model to previously reported in vivo intradiscal pressures and muscle activation patterns. Inclusion of the ribs and sternum caused an average decrease in vertebral compressive force of 33% for forward flexion and 18% in a lateral moment task. The impact of maximum muscle stress on vertebral force was limited to a narrow range of values. Compressive forces predicted by our model were strongly correlated to in vivo intradiscal pressure measurements in the thoracic (r=0.95) and lumbar (r=1) spine. Predicted trunk muscle activity was also strongly c...Continue Reading

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Citations

Sep 15, 2010·Current Osteoporosis Reports·Blaine A Christiansen, Mary L Bouxsein
Mar 21, 2013·Ergonomics·Patrick J LeeWilson C Hayes
Aug 9, 2013·Osteoporosis International : a Journal Established As Result of Cooperation Between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA·D E AndersonM L Bouxsein
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Dec 7, 2011·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·Elizabeth J SamelsonMary L Bouxsein
May 17, 2012·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·Alexander G BrunoMary L Bouxsein
Aug 21, 2013·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·Alexander G BrunoMary L Bouxsein
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Jun 26, 2014·Pain Practice : the Official Journal of World Institute of Pain·Hemmo A Bosscher, James E Heavner

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