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Role of optimization criterion in static asymmetric analysis of lumbar spine load

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Summary

A common method for load estimation in biomechanics is the inverse dynamics optimization, where the muscle activation pattern is found by minimizing or maximizing the optimization criterion. It has been shown that various optimization criteria predict remarkably similar muscle activation pattern and intra-articular contact forces during leg motion. The aim of this paper is to study the effect of the choice of optimization criterion on L4/L5 loading during static asymmetric loading. Upright standing with weight in one stretched arm was taken as a representative position. Musculoskeletal model of lumbar spine model was created from CT images of Visible Human Project. Several criteria were tested based on the minimization of muscle forces, muscle stresses, and spinal load. All criteria provide the same level of lumbar spine loading (difference is below 25%), except the criterion of minimum lumbar shear force which predicts unrealistically high spinal load and should not be considered further. Estimated spinal load and predicted muscle force activation pattern are in accordance with the intradiscal pressure measurements and EMG measurements. The L4/L5 spine loads 1312 N, 1674 N, and 1993 N were predicted for mass of weight in hand 2, 5, and 8 kg, respectively using criterion of mininum muscle stress cubed. As the optimization criteria do not considerably affect the spinal load, their choice is not critical in further clinical or ergonomic studies and computationally simpler criterion can be used.

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Abbreviations

F:

muscle force

P:

intraabdominal pressure force

R:

L4/L5 spine load

W:

body segment weight

r:

radius vector

G:

cost function

N:

number of muscles

PCSA:

physiological cross-section area

σ:

muscle stress

x, y, z:

coordinate system axes

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  1. Laboratory of Biomechanics, Faculty of Mechanical Engineering, Department of Mechanics, Biomechanics and Mechatronics, Czech Technical University in Prague, Prague, Technická, Czech Republic

    Matej Daniel

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Daniel, M. Role of optimization criterion in static asymmetric analysis of lumbar spine load. Wien Med Wochenschr 161, 477–485 (2011). https://doi.org/10.1007/s10354-011-0904-8

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  • DOI: https://doi.org/10.1007/s10354-011-0904-8

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