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

Higuchi, Ryo; Komatsu, Akira; Iida, Jumpei; Iwami, Takehiro; Shimada, Yasuhiro

doi:10.1299/jbse.18-00432

Cited by 4 publications

(13 citation statements)

References 44 publications

(72 reference statements)

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“…Therefore, a validated musculoskeletal model comparable to these previous studies is helpful to expand opportunities for investigation of the biomechanical behavior of the complete spine. The model employed in the present study was compared with these previous in vivo data [17] [18] [20], which showed that the predicted value with this model showed significant correlation with the literature value [23]. Further, while the results of intervertebral disc pressure in the validation study were calculated for healthy subjects, the present results demonstrated the value in patients with kyphosis for the first time.…”

Section: Discussionsupporting

confidence: 54%

“…This study examined intervertebral disc pressure of the entire spine, including the thoracic and lumbar spine, and evaluated the effect of kyphosis on intervertebral disc pressure using a novel musculoskeletal model developed at our institution [23]. One of the characteristics of this new model is that the thoracic cage, which was originally a rigid structure in a previous model [26], was divided into 12 vertebrae, 10 pairs of articulated ribs, and the sternum.…”

Section: Discussionmentioning

confidence: 99%

“…The muscle path were determined using a previously described wrapping method [28] that follows the geometric shape of the figure. The model was previously validated for accuracy of the predicted intervertebral disc pressure using inverse dynamics analysis [23], and was shown to accurately predict interverte-DOI: 10.4236/ojo.2019.911025 244 Open Journal of Orthopedics bral disc pressure in comparison with previous in vivo data [17] [18] [29]. The constructed model is shown in Figure 1.…”

Section: Biomechanical Modelmentioning

confidence: 97%

“…The novel thoracolumbar spine model used in this study was constructed with the commercially available AnyBody Modeling System software (AMS. V.6.0.5.4379) (AnyBody Technology, Alborg, Denmark) [23]. The original model was constructed based on a generic lumbar spine model [26], although the thorax was constructed as one rigid unit.…”

Section: Biomechanical Modelmentioning

confidence: 99%

“…Recently, several biomechanical studies using a musculoskeletal model of the entire spine, including the rib cage or whole body, have been developed [10] [21] [22] [23] [24]. We also developed a novel musculoskeletal model of the entire spinal column, which was modified from the original model for the lumbar spine, which included the thoracic cage as one rigid body [23]. The predicted intervertebral disc pressure of the spinal column as a whole with this model was validated to show the accuracy of measurements including the thoracic spine.…”

Section: Introductionmentioning

confidence: 99%

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Calculation of Intervertebral Disc Pressure in the Thoracic and Lumbar Spine in Elderly Women with Kyphosis Using a Novel Musculoskeletal Model with Isolated Thoracic Vertebrae and Rib Cage

Iida¹,

Miyakoshi²,

Hongo³

et al. 2019

OJO

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Background: Degeneration of the intervertebral disc is one of the causes of kyphosis. Several biomechanical studies have investigated the mechanisms of development of spinal deformity using simulation models. Realistic musculoskeletal models are helpful for investigating the pathophysiology and changes in internal forces in patients with kyphosis. However, the association between intervertebral disc pressure and kyphosis has not been fully elucidated to date. Purpose: To calculate intervertebral disc pressure in elderly women with kyphosis using a novel and precise thoracolumbar three-dimensional musculoskeletal model. Materials and Method: Ten female patients with a mean age of 80.0 ± 6.5 years who visited our hospital for medical examination of osteoporosis were included. The subjects were divided into the normal and kyphosis groups depending on their sagittal vertical axis. Intervertebral disc pressures in the thoracic and lumbar spines of subjects were analyzed by inverse dynamics analysis using a novel three-dimensional musculoskeletal model, and were compared between the groups. Result: Significant differences in lumbar lordosis (LL) were observed between the two groups. Furthermore, the kyphosis group was older and shorter. In the kyphosis group, the upper thoracic vertebrae (T1 -T6) showed significantly higher intervertebral pressure than the normal group. Conclusion: Intervertebral disc pressure in the thoracic and lumbar spines of patients with spinal deformities was evaluated using a novel thoracolumbar three-dimensional musculoskeletal model. Us-How to cite this paper: Iida, J., Miyakoshi,

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Section: Biomechanical Modelmentioning

confidence: 97%

Section: Biomechanical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Calculation of Intervertebral Disc Pressure in the Thoracic and Lumbar Spine in Elderly Women with Kyphosis Using a Novel Musculoskeletal Model with Isolated Thoracic Vertebrae and Rib Cage

Iida¹,

Miyakoshi²,

Hongo³

et al. 2019

OJO

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An articulated spine and ribcage kinematic model for simulation of scoliosis deformities

et al. 2021

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Musculoskeletal multibody modeling can offer valuable insight into aetiopathogenesis behind adolescent idiopathic scoliosis, which has remained unclear. However, the underlying model should represent anatomical joints with compatible kinematic constraints while allowing the model to attain scoliotic postures. This work presents an improved and kinematically determinate model including the whole spine and ribcage, which can attain typical scoliosis deformations of the thorax with compatible constraint strategy and simulate the interaction between all the bony segments of the ribcage and the spine. In the model, costovertebral/costotransverse joints were defined as universal joints based on reported anatomical studies.Articulations between ribs and the sternum were defined as spherical joints except in the ninth and tenth levels, which have one additional anteroposterior degree-of-freedom. The model is controlled by fifteen kinematic parameters including spinal rhythms and parameters relating to clinical metrics of scoliosis. These input values were measured from the bi-planar radiographs of a 17-year-old scoliosis patient with a right main thoracic curve of 33° Cobb angle. Dependent kinematic variables with clinical relevance were selected for validation purposes and compared with measurements from radiographs. The average errors of ribvertebra angles, rib-vertebra angle differences, and rib humps were 6.3° and 10.5°, and 8.7mm. The model appeared to reproduce the spine and rib deformation pattern conforming to radiographs, results in simulating the rib prominence, rib spread, rib-vertebra angles, and sternum orientation, therefore supporting the constraint definitions. The model can subsequently be used to investigate the kinetics of scoliosis and contribute to uncovering the aetiology.

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

Cited by 4 publications

References 44 publications

Calculation of Intervertebral Disc Pressure in the Thoracic and Lumbar Spine in Elderly Women with Kyphosis Using a Novel Musculoskeletal Model with Isolated Thoracic Vertebrae and Rib Cage

Calculation of Intervertebral Disc Pressure in the Thoracic and Lumbar Spine in Elderly Women with Kyphosis Using a Novel Musculoskeletal Model with Isolated Thoracic Vertebrae and Rib Cage

An articulated spine and ribcage kinematic model for simulation of scoliosis deformities

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

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