Effect of U-shaped implant on the biomechanics of the cervical spine

Mumtaz, Muzammil; Zafarparandeh, Iman; Paniz, Taherzadeh; Akıncı, Saliha Zeyneb; Erbulut, Deniz Ufuk

doi:10.1109/biyomut.2016.7849374

Cited by 5 publications

(6 citation statements)

References 3 publications

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“…A previously validated C2-T1 FE model was used in this study [ 14 , 15 , 16 ]. In summary, the model was developed based on the computed tomography (CT) scan data of a 35-year-old male.…”

Section: Methodsmentioning

confidence: 99%

“…In addition, DCIs are relatively less mobile compared to ball-socket TDR designs. The effect of DCIs with single-level disc replacement is presented in our conference proceedings [ 14 ]. In this study, the scope of our work has been extended to evaluate the biomechanics of single-levwl, multilevel and hybrid disc replacement surgery with DCIs and cervical fusion.…”

Section: Introductionmentioning

confidence: 99%

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Investigation into Cervical Spine Biomechanics Following Single, Multilevel and Hybrid Disc Replacement Surgery with Dynamic Cervical Implant and Fusion: A Finite Element Study

2022

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Cervical fusion has been a standard procedure for treating abnormalities associated with the cervical spine. However, the reliability of anterior cervical discectomy and fusion (ACDF) has become arguable due to its adverse effects on the biomechanics of adjacent segments. One of the drawbacks associated with ACDF is adjacent segment degeneration (ASD), which has served as the base for the development of dynamic stabilization systems (DSS) and total disc replacement (TDR) devices for cervical spine. However, the hybrid surgical technique has also gained popularity recently, but its effect on the biomechanics of cervical spine is not well researched. Thus, the objective of this FE study was to draw a comparison among single-level, bi-level, and hybrid surgery with dynamic cervical implants (DCIs) with traditional fusion. Reductions in the range of motion (ROM) for all the implanted models were observed for all the motions except extension, compared to for the intact model. The maximum increase in the ROM of 42% was observed at segments C5–C6 in the hybrid DCI model. The maximum increase in the adjacent segment’s ROM of 8.7% was observed in the multilevel fusion model. The maximum von Mises stress in the implant was highest for the multilevel DCI model. Our study also showed that the shape of the DCI permitted flexion/extension relatively more compared to lateral bending and axial rotation.

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“…A previously validated C2-T1 FE model was used in this study [ 14 , 15 , 16 ]. In summary, the model was developed based on the computed tomography (CT) scan data of a 35-year-old male.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation into Cervical Spine Biomechanics Following Single, Multilevel and Hybrid Disc Replacement Surgery with Dynamic Cervical Implant and Fusion: A Finite Element Study

2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…A previously validated C2-T1 FE model was used in this study [12][13][14]. In summary, the model was developed based on the computed tomography (CT) scan data of a 35-year-old male.…”

Section: Methodsmentioning

confidence: 99%

“…Also, DCI implant is relatively less mobile compared to ballsocket TDR designs. The effect of single level disc replacement DCI was present in our conference proceedings [12]. In this study, the scope of our work has been extended to evaluate the biomechanics of single, multilevel and hybrid disc replacement surgery with dynamic cervical implant and fusion.…”

Section: Introductionmentioning

confidence: 99%

Investigation Into Cervical Spine Biomechanics Following Single, Multilevel and Hybrid Disc Replacement Surgery With Dynamic Cervical Implant and Fusion: A Finite Element Study

Mumtaz¹,

Zafarparandeh²,

Erbulut³

2021

Preprint

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Cervical fusion has been a standard procedure for treating the abnormalities associated with the cervical spine. However, the reliability of anterior cervical discectomy and fusion (ACDF) has become arguable due to its adverse effects on the biomechanics of adjacent segments. One of the drawbacks associated with ACDF is adjacent segment degeneration (ASD) which has served as the base for the development of dynamic stabilization systems (DSS) and total disc replacement (TDR) devices for cervical spine. However, the hybrid surgical technique has also gained popularity recently but their effect on the biomechanics of cervical spine is not well researched. Thus, the objective of this FE study was to draw the comparison among single, bi-level and hybrid surgery with DCI implant with traditional fusion. Reduction in range of motion (ROM) for all the implanted models was observed for all the motions except extension, compared to intact model. The maximum increase in ROM of 42% was observed at C5-C6 level in Hybrid-DCI model. The maximum increase in adjacent segment’s ROM of 8.7% was observed in multilevel fusion model. The maximum von Mises stress in the implant was highest for the multilevel DCI model. Our study also showed that the shape of DCI implant permits flexion/extension relatively more compared to lateral bending and axial rotation.

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“…The meshed vertebrae/discs were exported to ABAQUS software (Dassault Systèmes, Simulia Inc., Providence, RI) to assemble the C2-C7 cervical spine. The anterior Longitudinal Ligament (ALL), posterior Longitudinal Ligament (PLL), interspinous ligament (ISL), supraspinous ligament (SSL), capsular ligament (CL), ligamentum flavum (LF) using truss elements in ABAQUS were added to the model 11 . The outer 0.5mm layer of vertebrae represented cortical shell, and the inside represented cancellous bone 12 .…”

Section: Model Developmentmentioning

confidence: 99%

Comparison of Laminoplasty on Lordotic, Straight and Kyphotic Cervical Alignments Suggest Poor Outcomes for Kyphotic Cervical Alignment: Finite Element Analysis

Nishida¹,

Mumtaz²,

Tripathi³

et al. 2022

Preprint

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Background: Cervical laminoplasty is a useful for treatment of cervical myelopathy. However, this procedure has limitations for kyphotic cervical alignments. We used the finite element (FE) analysis and investigated the biomechanical changes in an intact and laminoplasty models with lordosis, straight, and kyphosis cervical alignments. Methods: A three-dimensional FE model of the cervical spine (C2-C7) with ligaments was created from computed tomography. The model was modified with the following cobb angles and the C3-C6 laminoplasty was conducted; a) laminoplasty-lordotic model (LM-L; C2-C7 angle: -10°), b) laminoplasty-straight model (LM-S; C2-C7 angle: 0°), and c) laminoplasty-kyphotic model (LM-K; C2-C7 angle: 10°). A pure moment with a compressive follower load of 100N to represent the weight of the head/cranium and cervical muscle stabilization was applied to these models. The range of motion (ROM), annular stress, nucleus stress and facet forces were analyzed. Results: ROM of LM-K increased when compared to the other models except for flexion. The LM-K had the highest mobility with 49% increase in ROM observed under extension, compared to the intact model. In all motion except for flexion, LM-L models’ ROM decreased by more than 10%, and LM-S and LM-K models’ ROM increased by more than 10% at C2-C7 compared to the intact model. The annular stresses and nucleus stresses in LM-K were higher compared to the other models. The maximum increase in annular stresses was about 194% in LM-K compared to the intact model, observed at the C3-C4 segment. The facet contact forces were lowest in the LM-K, compared to the other models.Conclusions: Patients with a cervical kyphosis alignment are at a disadvantage of increased kyphosis compared to cases with lordosis or straight alignment and should be treated with caution.

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Effect of U-shaped implant on the biomechanics of the cervical spine

Cited by 5 publications

References 3 publications

Investigation into Cervical Spine Biomechanics Following Single, Multilevel and Hybrid Disc Replacement Surgery with Dynamic Cervical Implant and Fusion: A Finite Element Study

Investigation into Cervical Spine Biomechanics Following Single, Multilevel and Hybrid Disc Replacement Surgery with Dynamic Cervical Implant and Fusion: A Finite Element Study

Investigation Into Cervical Spine Biomechanics Following Single, Multilevel and Hybrid Disc Replacement Surgery With Dynamic Cervical Implant and Fusion: A Finite Element Study

Comparison of Laminoplasty on Lordotic, Straight and Kyphotic Cervical Alignments Suggest Poor Outcomes for Kyphotic Cervical Alignment: Finite Element Analysis

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