Motion analysis of lumbar vertebrae for different rod materials and flexible rod device – An experimental and finite element study

Rana, Masud; Biswas, Jayanta Kumar; Roy, Sandipan; Biswas, Prosenjit; Karmakar, Santanu Kumar; Roy-Chowdhury, Amit K.

doi:10.1016/j.bbe.2020.01.005

Cited by 16 publications

(11 citation statements)

References 46 publications

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“…Friction contact pair is generated between bone-implant surfaces, and frictional coefficient (µ) was set 0.3 and for the sliding spacer-rod, µ was set to be 0.1. 14,19…”

Section: Methodsmentioning

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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“…Friction contact pair is generated between bone-implant surfaces, and frictional coefficient (µ) was set 0.3 and for the sliding spacer-rod, µ was set to be 0.1. 14,19…”

Section: Methodsmentioning

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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“…Currently, many surgical instruments are available in the market, which aimed to the treatment of spinal instability subjected to various diseases. The most significant pedicle fixation consists of fused, 1 –3 dynamic 4–8 and semi-rigid stabilisation. 9 Rigid enables a higher fusion but did not improve the postoperative results.…”

Section: Introductionmentioning

confidence: 99%

“…9 Rigid enables a higher fusion but did not improve the postoperative results. 2,3 The study was conducted by Deyo et al, 10 concluded that from 1997 to 2001 there have been a 77% increase in the spinal fused fixation surgeries and continuing. Few researchers also revealed that the interbody fusion with rigid fixation may be an alternative to stabilise and restore spinal deformities.…”

Section: Introductionmentioning

confidence: 99%

Comparison of novel stabilisation device with various stabilisation approaches: A finite element based biomechanical analysis

Jain

Khan

2022

Int J Artif Organs

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The treatment of spinal failure requires suitable instrumentation, which is based on numerous concepts such as rigid fixation, semi-rigid and dynamic stabilisation. In the present work, the biomechanical investigation of various fixation systems on the lumbar segment L2–L3 was performed employing finite element analysis. Different devices were considered: novel stabilisation device (NSD), rigid implant (RI) and existing dynamic stabilisation device (EDSD). All instrumented models were loaded with a condition of 400 N compressive force with a moment of 10Nm during flexion, extension, lateral bending and axial rotation. The results of range of motion change (RMC), von-Mises stress and strain were compared. The spinal biomechanics post instrumentation resulted significantly sensitive to the geometrical feature of the implant. The obtained results showed that NSD has intermediate motion characteristics in between dynamic stabilisation and rigid fixation. However, the optimum features of a novel stabilisation device for the treatment of spinal failure still need to be verified employing in-vivo, in-vitro studies.

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“…5 To improve flexibility of the lumbar spine, Posterior Dynamic Stabilization system with a new flexible rod device has been implanted in the spine. 6,7…”

Section: Introductionmentioning

confidence: 99%

“…5 To improve flexibility of the lumbar spine, Posterior Dynamic Stabilization system with a new flexible rod device has been implanted in the spine. 6,7 Metals, allograft tissues, ceramics and polymers are some of the materials used as adjuncts to the surgery. UHMWPE, poly(ether ether ketone) (PEEK) and polyurethanes are among the polymers employed.…”

Section: Introductionmentioning

confidence: 99%

The influence of the viscoelastic property of polycarbonate urethane as an artificial disc core material under various physiological motions at the L4–L5 level

Jacob

Prakash

2022

Int J Artif Organs

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Intervertebral disc (IVD) degeneration is one of the musculoskeletal disorders due to the Degenerative Disc Disease (DDD), that cause low back pain (LBP) and leads to a reduced range of motion. Spinal fusion and arthroplasty are the other surgical procedures that could replace the disc affected by DDD against artificial disc replacement (ADR). This study aims to analyse the biomechanical behaviour of proposed core material as Polycarbonate Urethane (PCU) in the L4–L5 lumbar segment for ADR with Ti-6Al-4V and Co-28Cr-6M as endplate materials and compare it to the performance of an ultra-high molecular weight polyethylene (UHMWPE) core. Finite element methods have been approached to measure the overall stress distribution along with other physiological motions like Flexion (FLEX), Extension (EXT), Axial rotation (AR) and Lateral bending (LB), respectively. Preload of 450 N compressive load, 8 N-m for Flex, 6 N-m for EXT, 6 N-m for AR and 4 N-m for LB are applied. It could be concluded that Ti-6Al-4V – PCU and Co-28Cr-6M – PCU is the best composition for the ADR for the L4–L5 level.

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Motion analysis of lumbar vertebrae for different rod materials and flexible rod device – An experimental and finite element study

Cited by 16 publications

References 46 publications

Design and development of a novel expanding flexible rod device (FRD) for stability in the 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

Comparison of novel stabilisation device with various stabilisation approaches: A finite element based biomechanical analysis

The influence of the viscoelastic property of polycarbonate urethane as an artificial disc core material under various physiological motions at the L4–L5 level

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