Abstract
Musculoskeletal modeling of the thoracolumbar spine and trunk muscle are considered clinically useful for quantifying spinal disease processes. However, current models of thoracic spine are not evaluated for dynamical load and posture, or muscle path are constructed Via-Point (straight line muscle) type. In this study, we developed novel trunk musculoskeletal models of the predicted thoracolumbar load which are constructed muscle path in more detail, and validated developed models in dynamic loading and various postures. Developed spine models segmented 17 vertebrae, a sacrum, 10 pairs of ribs, a sternum and defined 17 intervertebral. Muscle path of the trunk muscle models constructed 2 types which are Via-Point type and Wrapping type (curved line muscle along ellipsoid). We estimated intradiscal pressure with constructed models and compared it with measured values. As a result, intradiscal pressure estimated by the model using Wrapping method had an extremely strong correlation with intradiscal pressure measurements made in the thoracic spine. Our results demonstrated significance to faithfully reproduce muscle path in developed musculoskeletal models.
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