Analysis of stress and stabilization in adolescent with osteoporotic idiopathic scoliosis: finite element method

Zhang, Qiaolin; Zhang, Yan; Chon, Teo Ee; Baker, Julien S.; Gu, Yaodong

doi:10.1080/10255842.2022.2044803

Cited by 24 publications

(23 citation statements)

References 47 publications

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“…It can achieve the effect of an in vivo experiment which is difficult to achieve through computer simulation technology without violating ethics [ 40 ]. In the spinal FE analysis, various motion states of the spine can be simulated by changing the load and boundary conditions, and the pathological changes of the spine can be simulated by changing material properties of model [ 22 ]. In the field of spinal research, the FE method is often used to analyze the stress of the spinal brace and to explore etiology.…”

Section: Discussionmentioning

confidence: 99%

“…The subject was in a supine position without weight. The subject was CT scanned (Siemens, Munich, Germany), the scanning interval used was 0.75 mm, and the CT image was converted into DOCM format in Mimics (Materialise, Leuven, Belgium) for follow-up 3D modeling [ 22 ]. This study was approved by the Ethics Committee of Ningbo University (RAGH20220321), and the subject fully understands the purpose of the experiment.…”

Section: Methodsmentioning

confidence: 99%

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The Effect of Concave-Side Intertransverse Ligament Laxity on the Stress of AIS Lumbar Spine Based on Finite Element Method

Zhang

et al. 2022

Bioengineering

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(1) Background: Scoliosis has the mechanical characteristic of asymmetric stress distribution, which is one of the reasons for the aggravation of scoliosis. Bracing therapy is the best treatment for AIS, but it is difficult and costly to operate. Is it possible to reduce pressure in the concave side by relaxing the ITL in the concave side of scoliosis, so as to improve the abnormal stress distribution of scoliosis? In this paper, a finite element method was used to simulate the effect of the relaxation of concave-side ITL on the stress of a lumbar spine with scoliosis, which provides some guidance for the treatment of scoliosis. (2) Methods: Using CT images of a patient with scoliosis whose Cobb Angle was 43° and Lordosis Angle was 45, a scoliosis lumbar was established, and Young’s modulus of the ITL of the concave-side lumbar spine was reduced by 95% to simulate ligament relaxation. By comparing the stress condition of the model vertebral body with no ligament relaxation, the effect of concave-side ITL relaxation on the mechanical characteristics of scoliosis lumbar spine was explored. (3) Results: An effective and complete model of the lumbar spine was established. The concave ITL relaxed, which only had a great impact on the bending loads. After the ligament was relaxed, the stability of the spine was reduced. Stress concentration on the concave side of vertebrae and the IVD was aggravated. Under loads on the convex side, the maximum stress on the vertebral body and the IVD increased significantly, making lumbar vertebrae more vulnerable to injury. (4) Conclusions: Laxity of the ITL on the concave side of the AIS lumbar only affects the bending load. Laxity of the concave-side ligament will reduce the stability of the lumbar, aggravate the uneven stress distribution of scoliotic lumbar vertebrae, increase the risk of IVD injury, and be unfavorable for the scoliotic lumbar spine. Relaxation of the concave ITL alone is not an effective way to treat scoliosis.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

The Effect of Concave-Side Intertransverse Ligament Laxity on the Stress of AIS Lumbar Spine Based on Finite Element Method

Zhang

et al. 2022

Bioengineering

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“…In this process, the cross-sectional area of the nucleus was set as 38% of the IVD, and the average radius of the IVD was set as 95.5% of the vertebral body’s average radius [ 16 – 18 ]. Fact cartilages of zygapophyseal joints (ZJs) were set as contact surfaces, and the contact type between cartilages was defined as frictionless [ 19 , 20 ]. Moreover, seven different ligamentum structures, including the anterior longitudinal ligament (ALL), posterior longitudinal ligament (PLL), ligamentum flavum (LF), inter transverse process ligament (ITL), super spinous process ligament (SSL), inter spinous process ligament (ISL), and capsule of ZJs, were constructed separately with different cross-sectional areas in the preprocessing process of the FE [ 19 , 20 ].…”

Section: Methodsmentioning

confidence: 99%

Stepwise reduction of bone mineral density increases the risk of cage subsidence in oblique lumbar interbody fusion patients biomechanically: an in-silico study

Yang

Cai

et al. 2022

BMC Musculoskelet Disord

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Background Cage subsidence causes poor prognoses in patients treated by oblique lumbar interbody fusion (OLIF). Deterioration of the biomechanical environment initially triggers cage subsidence, and patients with low bone mineral density (BMD) suffer a higher risk of cage subsidence. However, whether low BMD increases the risk of cage subsidence by deteriorating the local biomechanical environment has not been clearly identified. Methods OLIF without additional fixation (stand-alone, S-A) and with different additional fixation devices (AFDs), including anterolateral single rod screws (ALSRs) and bilateral pedicle screws (BPSs) fixation, was simulated in the L4-L5 segment of a well-validated finite element model. The biomechanical effects of different BMDs were investigated by adjusting the material properties of bony structures. Biomechanical indicators related to cage subsidence were computed and recorded under different directional moments. Results Overall, low BMD triggers stress concentration in surgical segment, the highest equivalent stress can be observed in osteoporosis models under most loading conditions. Compared with the flexion-extension loading condition, this variation tendency was more pronounced under bending and rotation loading conditions. In addition, AFDs obviously reduced the stress concentration on both bony endplates and the OLIF cage, and the maximum stress on ALSRs was evidently higher than that on BPSs under almost all loading conditions. Conclusions Stepwise reduction of BMD increases the risk of a poor local biomechanical environment in OLIF patients, and regular anti-osteoporosis therapy should be considered an effective method to biomechanically optimize the prognosis of OLIF patients.

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Section: Introductionmentioning

confidence: 99%

“…However, the FEA also has certain drawbacks when comparing the stress characteristics of different models after the FEA ( 15 , 16 ). In other words, such comparison after FEA is usually based on stress distribution trends and maximum stress values ( 13 , 16 , 17 ), which is a certain contingency ( 15 , 18 ). For example, the maximum stress value is often related to the smoothness and morphological characteristics of the finite element model, so the comparison method of maximum stress value cannot be used to comprehensively and deeply explore the mechanical mechanism of the bone.…”

Section: Introductionmentioning

confidence: 99%

A new method proposed to explore the feline's paw bones of contributing most to landing pattern recognition when landed under different constraints

Zhou

Zhang

et al. 2022

Front. Vet. Sci.

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Felines are generally acknowledged to have natural athletic ability, especially in jumping and landing. The adage “felines have nine lives” seems applicable when we consider its ability to land safely from heights. Traditional post-processing of finite element analysis (FEA) is usually based on stress distribution trend and maximum stress values, which is often related to the smoothness and morphological characteristics of the finite element model and cannot be used to comprehensively and deeply explore the mechanical mechanism of the bone. Machine learning methods that focus on feature pattern variable analysis have been gradually applied in the field of biomechanics. Therefore, this study investigated the cat forelimb biomechanical characteristics when landing from different heights using FEA and feature engineering techniques for post-processing of FEA. The results suggested that the stress distribution feature of the second, fourth metacarpal, the second, third proximal phalanx are the features that contribute most to landing pattern recognition when cats landed under different constraints. With increments in landing altitude, the variations in landing pattern differences may be a response of the cat's forelimb by adjusting the musculoskeletal structure to reduce the risk of injury with a more optimal landing strategy. The combination of feature engineering techniques can effectively identify the bone's features that contribute most to pattern recognition under different constraints, which is conducive to the grasp of the optimal feature that can reveal intrinsic properties in the field of biomechanics.

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Analysis of stress and stabilization in adolescent with osteoporotic idiopathic scoliosis: finite element method

Cited by 24 publications

References 47 publications

The Effect of Concave-Side Intertransverse Ligament Laxity on the Stress of AIS Lumbar Spine Based on Finite Element Method

The Effect of Concave-Side Intertransverse Ligament Laxity on the Stress of AIS Lumbar Spine Based on Finite Element Method

Stepwise reduction of bone mineral density increases the risk of cage subsidence in oblique lumbar interbody fusion patients biomechanically: an in-silico study

A new method proposed to explore the feline's paw bones of contributing most to landing pattern recognition when landed under different constraints

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