Prediction of biomechanical behavior of lumbar vertebrae using a novel semi-rigid stabilization device

Jain, Pushpdant; Khan, Mohammed Rajik

doi:10.1177/0954411919856497

Cited by 14 publications

(11 citation statements)

References 28 publications

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“…To consider the bone degeneracy this variation of bone had been considered and properties of all bone groups were represented in Table 2 3. 17 Total sixteen numbers vertebral models; (i) intact spine L2-3 number models (WB+NB+SB+VSB) (ii) 5.5 dia. screw-four number models (WB+NB+SB+VSB) iii) 6.0 dia.…”

Section: Model Generation and Materials Propertiesmentioning

confidence: 99%

Selection of suitable pedicle screw for degenerated cortical and cancellous bone of human lumbar spine: A finite element study

Jain

Khan

2020

Int J Artif Organs

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Pedicular arthrodesis is the traditional procedure in terms of increase in the biomechanical stability with higher fixation rate. The current work aims to identify the effect of three spinal pedicle screws considering cortical and cancellous degeneracy condition. Lumbar section L2-L3 is utilized and various load and moment conditions were applied to depict the various biomechanical parameters for selection of suitable screw. Three dimensional model is considered in finite element analysis to identify the various responses of pedicle screw at bone screw juncture. Computed tomography (CT) images of a healthy male were considered to generate the finite element vertebral model. Generated intact model was further utilized to develop the other implanted models of degenerated cortical and cancellous bone models. The three fused instrumented models with different cortical and cancellous degeneracy conditions were analyzed in finite element analysis. The results were obtained as stress pattern at bone screw boundary and intervertebral disc stress. FE simulated results represents significant changes in the von Mises stress due to various load and moment conditions on degenerated bones during different body movement conditions. Results have shown that among all pedicle screws, the 6.0 mm diameter screw reflects very less stress values at the juncture. Multiple results on biomechanical aspects obtained during the FE study can be considered to design a new stabilization device and may be helpful to plan surgery of critical sections.

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Section: Model Generation and Materials Propertiesmentioning

confidence: 99%

Selection of suitable pedicle screw for degenerated cortical and cancellous bone of human lumbar spine: A finite element study

Jain

Khan

2020

Int J Artif Organs

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“…To simulate physiological flexion, extension, lateral bending and axial rotational motions, 2, 4, 6, 8 and 10 Nm bending moment are applied on L1 vertebrae to implanted (FRD) and intact (natural) models. 20 Multilinear stress-strain curve Ligaments [16][17][18] Young's modulus (MPa) Poisson's ratio Anterior longitudinal ligament (ALL) 7.8 (ε < 12%) 20 (ε > 12%) 0.3 Posterior longitudinal ligament (PLL)…”

Section: Boundary Conditionmentioning

confidence: 99%

Design and development of a novel expanding flexible rod device (FRD) for stability in the lumbar spine: A finite-element study

et al. 2020

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The aim of this study is to design a novel expanding flexible rod device, for pedicle screw fixation to provide dynamic stability, based on strength and flexibility. Three-dimensional finite-element models of lumbar spine (L1-S) with flexible rod device on L3-L4-L5 levels are developed. The implant material is taken to be Ti-6Al-4V. The models are simulated under different boundary conditions, and the results are compared with intact model. In natural model, total range of motion under 10 Nm moment were found 66.7°, 24.3° and 13.59°, respectively during flexion–extension, lateral bending and axial rotation. The von Mises stress at intact bone was 4 ± 2 MPa and at bone, adjacent to the screw in the implanted bone, was 6 ± 3 MPa. The von Mises stress of disc of intact bone varied from 0.36 to 2.13 MPa while that of the disc between the fixed vertebra of the fixation model reduced by approximately 10% for flexion and 25% for extension compared to intact model. The von Mises stresses of pedicle screw were 120, 135, 110 and 90 MPa during flexion, extension, lateral bending, and axial rotation, respectively. All the stress values were within the safe limit of the material. Using the flexible rod device, flexibility was significantly increased in flexion/extension but not in axial rotation and lateral bending. The results suggest that dynamic stabilization system with respect to fusion is more effective for homogenizing the range of motion of the spine.

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“…Some studies are there, where finite element (FE) analysis has been used to quantify ROM as a measure of spinal flexibility in lumbar spine. [6][7][8] Similar kind of studies were also conducted experimentally on human cadaver. 9,10 Biocompatible metals and alloys, such as titanium and its alloys, stainless steel etc.…”

Section: Introductionmentioning

confidence: 95%

Effect of single and multilevel artificial inter-vertebral disc replacement in lumbar spine: A finite element study

et al. 2021

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Degenerative disc disease (DDD) in lumbar spine is one of the major musculoskeletal disorders that cause low back pain (LBP). The intervertebral disc structure and dynamics of the lumbar spine are significantly affected by lumbar DDD, leading to a reduced range of motion (ROM), muscle weakness and gradual degradation. Spinal fusion and inter-vertebral disc replacement prostheses are two major surgical methods used for treating lumbar DDD. The aim of this present study is to examine biomechanical impacts of single level (L3-L4 and L4-L5) and multi level (L3-L4-L5) inter-vertebral disc replacement in lumbar spine (L2-L5) and to compare the performance with intact spine. Finite element (FE) analysis has been used to compare the mobility and stress distribution of all the models for four physiological movements, namely flexion, extension, left and right lateral bending under 6, 8 and 10 Nm moments. Spinal fusion implants completely restrict the motion of the implanted segment and increase disc stress at the adjacent levels. In contrast to that, the results single level ADR models showed closer ROM and disc stress to natural model. At the spinal segments adjacent to the implantation, single level ADR shows lower chance of disc degeneration. However, significantly increased ROM was observed in case of double level ADR.

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Prediction of biomechanical behavior of lumbar vertebrae using a novel semi-rigid stabilization device

Cited by 14 publications

References 28 publications

Selection of suitable pedicle screw for degenerated cortical and cancellous bone of human lumbar spine: A finite element study

Selection of suitable pedicle screw for degenerated cortical and cancellous bone of human lumbar spine: A finite element study

Design and development of a novel expanding flexible rod device (FRD) for stability in the lumbar spine: A finite-element study

Effect of single and multilevel artificial inter-vertebral disc replacement in lumbar spine: A finite element study

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