Construction and validation of a three-dimensional trunk musculoskeletal model by using data from Computed Tomography (CT) and Magnetic Resonance Imaging (MRI)

Iwami, Takehiro; Komatsu, Akira; Otaka, Kohei; Miura, Hiroki; Hatakeyama, Kazutoshi; Shimada, Yasuhiro; Kobayashi, Yoshikazu

doi:10.1299/transjsme.16-00318

Cited by 5 publications

(13 citation statements)

References 37 publications

(3 reference statements)

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“…All joints were based on previous studies (de Zee et al, 2007, Bazrgari et al, 2009, Raabe and Chaudhari, 2016. Iwami et al, 2017) of the ratio of each partial mass to the body mass. The constructed skeletal model is shown in Fig.…”

Section: Definition Of Segments and Jointsmentioning

confidence: 99%

“…We defined trunk muscles based on a previous study (Iwami et al, 2017). The trunk muscles in the present study comprised five muscle groups, for a total of 15 individual muscles, and a total of 328 fascicles: short dorsal muscles (interspinales and intertransversarii), transversospinalis muscles (semispinalis thoracis, multifidus, rotatores breves and rotatores longi), erector spinae muscles (iliocostalis lumborum, iliocostalis thoracis, longissimus thoracis and spinalis thoracis), abdominal muscles (rectus abdominal, internal oblique, external oblique and quadratus lumborum), and psoas muscles (psoas major).…”

Section: Trunk-muscle Model and Muscle Pathsmentioning

confidence: 99%

“…The origin and insertion point of the muscle paths were decided based on MRI data (Iwami et al, 2017) and anatomical descriptions (Fujita, 1993, Tortora andDerrickson, 2013), and the muscle models were constructed by connecting the origin and insertion. However, the actual muscle paths spread along the surface of the bone and fat; many of the muscle paths are curved planes that follow the skeleton and soft tissue.…”

Section: Trunk-muscle Model and Muscle Pathsmentioning

confidence: 99%

“…Regarding the muscle paths, only an upright standing position is guaranteed, and there is a problem of diverging from the actual muscle paths during the dynamic analysis. The accuracy of this previously constructed model (Iwami et al, 2017) under dynamic conditions and at the level of the thoracic spine has not been confirmed, so it is considered unsuitable for clinical applications.…”

Section: Introductionmentioning

confidence: 99%

“…constructed a movable thoracolumbar spine model to analyze the IDP, and the activity and tension of trunk muscles during flexion; however, the placement and geometry of the trunk muscles were not defined in detail because all of the muscle paths of the model were linear. Therefore, the authors constructed a three-dimensional trunk musculoskeletal model reproducing the muscle paths based on computed tomography (CT) and magnetic resonance imaging (MRI) data, and validated the predicted accuracy of the IDP at only the L4/L5 level (Iwami et al, 2017). However, its usefulness as a dynamic thoracolumbar spine model is inadequate, as the model was under static conditions and only validated at the L4/L5 level.…”

Section: Introductionmentioning

confidence: 99%

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Construction and validation under dynamic conditions of a novel thoracolumbar spine model with defined muscle paths using the wrapping method

Higuchi

Komatsu

Iida

et al. 2019

JBSE

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We developed novel trunk musculoskeletal models with detailed muscle paths for predicting the thoracolumbar load, and validated the developed models under dynamic loading and various postures. Two types of musculoskeletal models with different paths of the trunk muscles were constructed: a Via-Point type (with linear muscles) and Wrapping type (with curved muscles along ellipsoids). We predicted the intradiscal pressure (IDP) with the models and compared the results with literature values. The IDP predicted using the wrapping-type model had an extremely strong correlation with IDP measurements from the thoracic spine. The results demonstrate the effectiveness of more accurate muscle paths in musculoskeletal models for predicting the thoracolumbar load.

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Section: Definition Of Segments and Jointsmentioning

confidence: 99%

Section: Trunk-muscle Model and Muscle Pathsmentioning

confidence: 99%

Section: Trunk-muscle Model and Muscle Pathsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Construction and validation under dynamic conditions of a novel thoracolumbar spine model with defined muscle paths using the wrapping method

Higuchi

Komatsu

Iida

et al. 2019

JBSE

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Optimal occlusal force field of masticatory system under clenching by simplex method and principal component analysis

NOGUCHI

SHIBUTANI

2023

Transactions of the JSME (In Japanese)

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In the present paper, a method to evaluate the occlusal state and occlusal morphology that can integrate an optimal occlusal force field under clenching is proposed using simplex optimization and principal component analysis (PCA). The objective function of the optimization is taken as a sum of the weighted occlusal forces and reaction on temporomandibular joint (TMJ) to maximize the former and to minimize the latter. The optimized solutions in the region defined by the combination among three kinds of muscle forces were obtained by two-step simplex method, and the subregion with no reaction of TMJ was summarized as a ratio to the whole region, newly defined here as a good balance ratio. As a result of PCA of total 528 samples of the good balance ratios for 13 different muscle force combinations, two principal components (PCs) are enough to represent the optimized masticatory system. The first PC suggests the ideal state of occlusion and the second one implies the characterization of combination among muscles. From the consideration of PCA, with the wider equalizer angle, the easier it is to support the force of the temporalis muscle in an ideal occlusal position, and the more the occlusal contact point is shifted backward, the harder it is to support the force of the temporalis muscle. Comprehensively, the proposed good balance ratio becomes the effective quantity to evaluate the ideal masticatory system with the optimized occlusal force field for the statistically reduced indexes showing the combination of muscles.

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Association between global sagittal malalignment and increasing hip joint contact force, analyzed by a novel musculoskeletal modeling system

et al. 2021

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Patients with adult spinal deformity have various standing postures. Although several studies have reported a relationship between sagittal alignment and exacerbation of hip osteoarthritis, information is limited regarding how spinopelvic sagittal alignment changes affect hip joint loading. This study aimed to investigate the relationship between sagittal spinopelvic-lower limb alignment and the hip joint contact force (HCF) using a novel musculoskeletal model. We enrolled 20 women (78.3±6.7 years) from a single institution. Standing lateral radiographs were acquired to measure thoracic kyphosis, lumbar lordosis, the pelvic tilt, sacral slope, sagittal vertical axis (SVA), femur obliquity angle, and knee flexion angle. In the model simulation, the Anybody Modeling System was used, which alters muscle pathways using magnetic resonance imaging data. Each patient’s alignment was entered into the model; the HCF and hip moment in the standing posture were calculated using inverse dynamics analysis. The relationship between the HCF and each parameter was examined using Spearman’s correlation coefficient (r). The patients were divided into low SVA and high SVA groups, with a cutoff value of 50 mm for the SVA. The HCF was 168.2±60.1 N (%BW) and positively correlated with the SVA (r = 0.6343, p<0.01) and femur obliquity angle (r = 0.4670, p = 0.03). The HCF were 122.2 and 214.1 N (75.2% difference) in the low SVA and high SVA groups, respectively (p<0.01). The flexion moment was also increased in the high SVA group compared with that in the low SVA group (p = 0.03). The SVA and femur obliquity angle are factors related to the HCF, suggesting an association between adult spinal deformity and the exacerbation of hip osteoarthritis. Future studies will need to assess the relationship between the hip joint load and sagittal spinopelvic parameters in dynamic conditions.

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Construction and validation of a three-dimensional trunk musculoskeletal model by using data from Computed Tomography (CT) and Magnetic Resonance Imaging (MRI)

Cited by 5 publications

References 37 publications

Construction and validation under dynamic conditions of a novel thoracolumbar spine model with defined muscle paths using the wrapping method

Construction and validation under dynamic conditions of a novel thoracolumbar spine model with defined muscle paths using the wrapping method

Optimal occlusal force field of masticatory system under clenching by simplex method and principal component analysis

Association between global sagittal malalignment and increasing hip joint contact force, analyzed by a novel musculoskeletal modeling system

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