Effect of two-level pedicle-screw fixation with different rod materials on lumbar spine: A finite element study

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

doi:10.1016/j.jos.2017.10.009

Cited by 49 publications

(41 citation statements)

References 35 publications

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“…In extension motion, as seen from Figure 5 shows the maximum pressure Table 3. Comparison of ROM for the present study with past studies (Yamamoto et al, 25 Shin et al, 6 Biswas et al, 26 Pearcy and Tibrewal 27…”

Section: Intradiscal Pressuresupporting

confidence: 62%

“…As analyzed from the results, the change in biomechanical characteristics of SRSDbased model lies in between DS and RI-based models. However, there are other factors such as change of material, 26,30,31 implant architecture, 19 stiffness, 6,19 which may influence the biomechanical aspects and this may also require further clinical studies.…”

Section: Discussionmentioning

confidence: 99%

“…For validation of our intact vertebral model L2-L3, a detailed comparison of kinematics data of present study and studies of Yamamoto et al, 25 Shin et al, 6 Biswas et al 26 and Pearcy and Tibrewal 27 are listed in Table 3. A boundary condition of pure moment (10 N m) adopted from the literatures was chosen for our intact spine model under flexion, extension and bending.…”

Section: Validation Of Intact Spine Modelmentioning

confidence: 99%

“…Twisting motion was not considered as there was no sufficient information available in the literature for similar boundary conditions. The formulation for analytical calculation of ROM is considered from the study of Biswas et al 26 Table 3 presents the comparisons of ROMs considered during flexion-extension and bending observed during various studies and the present one.…”

Section: Validation Of Intact Spine Modelmentioning

confidence: 99%

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

Jain

Khan

2019

Proc Inst Mech Eng H

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The work investigates the effect of proposed novel semi-rigid stabilization device on lumbar segment L2-L3 so as to preserve motion at vertebral level. Here, the biomechanical behavior of intact spine with three instrumented spinal models (semi-rigid stabilization device, rigid implant and dynamic stabilization system NFlex) have been compared under the motion conditions of flexion, extension, bending and twist. Three-dimensional non-linear finite models of intact spine, semi-rigid stabilization device, rigid implant and dynamic stabilization system NFlex were developed in the present study. All the four models were subjected to a combined load of 400 N in axial compression along with 2, 4, 6, 8 and 10 N m as bending moment individually. Dynamic stabilization system NFlex shows the maximum variation in motion and reflects range of motion as 89.7% during lateral bending, 53.4% in flexion, 34.6% in twist and 28.0% in extension with respect to intact spine. However, semi-rigid stabilization device and rigid implant shows the range of motion of 60%, 48.7%, 32% and 21.8% and 60%, 32.3%, 22.3% and 21.7% of intact, respectively, during bending, flexion, twist and extension. Finite element simulation results reveal that semi-rigid stabilization device shows comparatively lower values than dynamic stabilization system NFlex and higher as compared to rigid implant for measured intradiscal pressure and von Mises strain at intervertebral disc-23.

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Section: Intradiscal Pressuresupporting

confidence: 62%

Section: Discussionmentioning

confidence: 99%

Section: Validation Of Intact Spine Modelmentioning

confidence: 99%

Section: Validation Of Intact Spine Modelmentioning

confidence: 99%

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

Jain

Khan

2019

Proc Inst Mech Eng H

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“…In recent years, this technique has been accepted by an increasing number of surgeons. e PEEK rod-pedicle screw stabilization system, which is a semirigid fixation system, can effectively limit motion of the fixed segments and provide maximal "micromotion" [18][19][20]. While stabilizing the spine, this system minimizes the risk of ASD caused by rigid fixation.…”

Section: Discussionmentioning

confidence: 99%

Efficacy Analysis of Percutaneous Endoscopic Lumbar Discectomy Combined with PEEK Rods for Giant Lumbar Disc Herniation: A Randomized Controlled Study

Gao

Tang

Xia

et al. 2020

Pain Research and Management

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Objective. This study describes a randomized controlled trial that assesses percutaneous endoscopic lumbar discectomy (PELD) combined with a polyetheretherketone (PEEK) rod in patients with GLDH (herniation affecting 50% of the sagittal diameter of the spinal canal) and reports the 2-year follow-up outcome. Methods. In all, 243 patients were randomly assigned to undergo PELD or PELD combined with a PEEK rod by generating random numbers with a random number generator. Clinical outcome data, including the numerical rating scale (NRS), were used to assess the patients’ back and leg pain, while the Oswestry Disability Index (ODI) was used to quantify pain and disability. Imaging data included intervertebral disc height (IDH), range of motion (ROM), and modified Pfirrmann grades. Results. At the final follow-up, the NRS for back and leg pain and the ODI scores were significantly decreased in both groups. The NRS for back pain and the ODI scores in the PELD + PEEK group (1.32 ± 0.70, 14.10 ± 4.74) were better than those in the PELD group (1.91 ± 0.69, 16.93 ± 4.33) (P<0.05). The IDH of the PELD + PEEK group (10.54 ± 1.62) was significantly higher than that in the PELD group (9.98 ± 1.90) (P=0.025). The ROM of the PELD + PEEK group (2.39 ± 0.90) was significantly lower than that of the PELD group (9.49 ± 1.62) (P<0.001). Conclusion. For symptomatic patients with GLDH, both PELD and PELD combined with a PEEK rod showed good efficacy. However, the long-term effect of PELD combined with a PEEK rod is better than that of PELD alone. Moreover, PELD combined with a PEEK rod can effectively reduce the recurrence rate. Maximum benefit can be gained if we adhere to strict selection criteria for PELD combined with a PEEK rod.

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Symbolic regression metamodel-based optimal design of patient-specific spinal implant (pedicle screw fixation)

Biswas

Kalita

Roy-Chowdhury

2020

Engineering with Computers

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Effect of two-level pedicle-screw fixation with different rod materials on lumbar spine: A finite element study

Cited by 49 publications

References 35 publications

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

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

Efficacy Analysis of Percutaneous Endoscopic Lumbar Discectomy Combined with PEEK Rods for Giant Lumbar Disc Herniation: A Randomized Controlled Study

Symbolic regression metamodel-based optimal design of patient-specific spinal implant (pedicle screw fixation)

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