The biomechanical study of cervical spine: A Finite Element Analysis

Manickam, P.; Roy, Sandipan

doi:10.1177/0391398821995495

Cited by 27 publications

(31 citation statements)

References 41 publications

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“…This suggests that Group 2 is closer to the physiological cervical biomechanical characteristics; Group 1 and Group 2 had similar effects on the average intervertebral disc pressure at the intermedial level (C4/5). Considering the mobility of the intermedial intervertebral disc of Group 1 was higher than Group 2, the protective effect of Group 1 on the intermedial intervertebral disc might be achieved by increasing segmental ROM to buffer the intervertebral disc pressure [24].…”

Section: Discussionmentioning

confidence: 98%

“…Material properties and element types are shown in Table 2 [15,17,[21][22][23]. In these FEMs, the thickness of cortical shell and endplates was set as 0.4 mm [24]. As to the facet joint, the articular surface was covered with cartilage, which was assigned with nonlinear surface-tosurface contact; the thickness of cartilage and the gap were 0.5 mm [14].…”

Section: Materials Propertiesmentioning

confidence: 99%

“…The interfaces between natural structures of the cervical spine were assigned with a tie constraint; the contact of facet joints was set to a friction sliding; the C7 bottom surface was set to completely constrained in all degrees of freedom [24]. The simulation of screw-vertebra interface and screw-implant interface was set to a tie constraint; the interface between the cancellous bone graft and CoRoent ® Contour was assigned with a frictionless contact; end plates and nucleus of ProDisc-C were set to have full surface contact with a tie constraint [17,21].…”

Section: Experimental Conditionmentioning

confidence: 99%

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Biomechanical effects of hybrid constructions in the treatment of noncontinuous cervical spondylopathy: a finite element analysis

Sun

Zhang

et al. 2023

J Orthop Surg Res

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Background Hybrid construction (HC) may be an ideal surgical strategy than noncontinuous total disc replacement (TDR) and noncontinuous anterior cervical discectomy and fusion (ACDF) in the treatment of noncontinuous cervical spondylopathy. However, there is still no consensus on the segmental selection for ACDF or TDR in HC. The study aims to analyse the effects of different segment selection of TDR and ACDF on cervical biomechanical characteristics after HC surgery. Methods Twelve FEMs of C2–C7 were constructed based on CT images of 12 mild cervical spondylopathy volunteers. Two kinds of HC were introduced in our study: Fusion-arthroplasty group (Group 1), upper-level (C3/4) ACDF, and lower-level TDR (C5/6); Arthroplasty-fusion group (Group 2), upper-level (C3/4) TDR and lower-level ACDF (C5/6). The follow-load technique was simulated by applying an axial initial load of 73.6 N through the motion centre of FEM. A bending moment of 1.0 Nm was applied to the centre of C2 in all FEMs. Statistical analysis was carried out by SPSS 26.0. The significance threshold was 5% (P < 0.05). Results In the comparison of ROMs between Group 1 and Group 2, the ROM in extension (P = 0.016), and lateral bending (P = 0.038) of C4/5 were significantly higher in Group 1 group. The average intervertebral disc pressures at C2/3 in all directions were significantly higher in Group 1 than those in Group 2 (P < 0.005). The average contact forces in facet joints of C2/3 (P = 0.007) were significantly more than that in Group 2; however, the average contact forces in facet joints of C6/7 (P < 0.001) in Group 1 group were significantly less than that in Group 2. Conclusions Arthroplasty-fusion is preferred for intervertebral disc degeneration in adjacent upper segments. Fusion-arthroplasty is preferred for patients with lower intervertebral disc degeneration or lower posterior column degeneration. Trial registration: This research was registered in Chinese Clinical Trial Registry (ChiCTR1900020513).

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Section: Discussionmentioning

confidence: 98%

Section: Materials Propertiesmentioning

confidence: 99%

Section: Experimental Conditionmentioning

confidence: 99%

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Biomechanical effects of hybrid constructions in the treatment of noncontinuous cervical spondylopathy: a finite element analysis

Sun

Zhang

et al. 2023

J Orthop Surg Res

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“…26,27 A moment of 1 Nm is applied in all physiological motion. 26–28 In all the loading protocols the inferior endplate of C6 level motion was fully constrained.…”

Section: Methodsmentioning

confidence: 99%

The biomechanical effects of S-type dynamic cage using Ti and PEEK for ACDF surgery on cervical spine varying loads

Manickam

Roy

2021

Int J Artif Organs

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Anterior cervical discectomy with fusion (ACDF) is the common method to treat the cervical disc degeneration. The most serious problems in the fusion cages are adjacent disc degeneration, loss of lordosis, pain, subsidence, and migration of the cage. The objective of our work is to develop the three-dimensional finite element (FE) model from C3-C6 and virtually implant a designed S-type dynamic cage at C4-C5 segment of the model. The dynamic cage design will provide mobility in the early stage after ACDF surgery. Titanium (Ti) and PEEK (polyether ether ketone) were used as the material property for the cages. We applied the physiological motions at different loads from 0.5, 1, 1.5, 2.0 Nm to evaluate the dynamic cage design and the biomechanical performances of the designed S-type dynamic cage. It was observed that in all the loading condition the range of motion in the adjacent level was maintained and the maximum stress at the adjacent disc was reduced. The clinical significance of the S-type dynamic cage is better stress profile at the fusion level and adjacent segments which translates into higher rate of fusion, lower risk of cage subsidence, lower risk of adjacent segment degeneration, and good mechanical stability.

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“…FEM can be used to examine the following issues relating to degenerative disc disease: (a) the etiology of intervertebral disc degeneration (IVDD), including biological and biomechanical pathogenesis, (b) the biology, biochemistry and biomechanics of IVDD, and (c) the examination of biological and surgical management for IVDD [37][38][39][40][41][42][43][44]. In particular, in a recent FEM study that ascertained the biomechanical consequences of a degenerated L4-L5 segment, it was found that abnormal loading and motion in the degenerated models enhanced degeneration in the neighboring normal segments [45,46].…”

Section: Degenerative Disc Diseasementioning

confidence: 99%

Finite Element Method for the Evaluation of the Human Spine: A Literature Overview

Naoum

Vasiliadis

Koutserimpas

et al. 2021

JFB

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The finite element method (FEM) represents a computer simulation method, originally used in civil engineering, which dates back to the early 1940s. Applications of FEM have also been used in numerous medical areas and in orthopedic surgery. Computing technology has improved over the years and as a result, more complex problems, such as those involving the spine, can be analyzed. The spine is a complex anatomical structure that maintains the erect posture and supports considerable loads. Applications of FEM in the spine have contributed to the understanding of bone biomechanics, both in healthy and abnormal conditions, such as scoliosis, fractures (trauma), degenerative disc disease and osteoporosis. However, since FEM is only a digital simulation of the real condition, it will never exactly simulate in vivo results. In particular, when it concerns biomechanics, there are many features that are difficult to represent in a FEM. More FEM studies and spine research are required in order to examine interpersonal spine stiffness, young spine biomechanics and model accuracy. In the future, patient-specific models will be used for better patient evaluations as well as for better pre- and inter-operative planning.

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The biomechanical study of cervical spine: A Finite Element Analysis

Cited by 27 publications

References 41 publications

Biomechanical effects of hybrid constructions in the treatment of noncontinuous cervical spondylopathy: a finite element analysis

Biomechanical effects of hybrid constructions in the treatment of noncontinuous cervical spondylopathy: a finite element analysis

The biomechanical effects of S-type dynamic cage using Ti and PEEK for ACDF surgery on cervical spine varying loads

Finite Element Method for the Evaluation of the Human Spine: A Literature Overview

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