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Finite element analysis of double diamond lattice structured lumbar interbody fusion cage with different biomaterials

Athikesavan D., Alphin M.S., Meganathan S.

Acta of Bioengineering and Biomechanics

2024

Vol. 26, no. 4

3--18

In recent years, low back pain has emerged as a significant global health issue, largely attributed to the prevalence of lumbar disc degeneration (LDD). This increases high demand on implant manufacturing due to the uniqueness of each patient’s anthropometry. Which creates a surge in the implant design and its performance study. This work employed finite element analysis to evaluate the efficacy of Interbody cage fusion in combination with different biostructures and biomaterials. Methods: The Lumbar Model was created by incorporating a surgical implant cage that featured three different lattice architectures using Boolean operations. We constructed four models, one model that was not altered and three models that underwent surgical procedures. The surgical models consist of three types of lattice implants are double diamond (DD), double diamond centre support (DDCS), double diamond side support (DDSS). Results: The results indicate that the double diamond (DD) lattice-structured polyether ether ketone (PEEK) material implant experiences the most deformation, measuring 0.67 mm, when subjected to axial rotation motion. An analysis indicates the implant made with the DDCS lattice structure and Ti-6Al-4V material is subjected to the least stress – it stood at 75.47 MPa as the smallest stress level recorded. Conclusions: The result of endplate von mises stress shows the PEEK material with DDCS lattice structured implant have low stress. Ti-6Al-4V and Stainless steel having high stress of 20 MPa on endplates. Comparatively Ti-6Al-4V having very good response with literature data. These results are providing insights towards the selection of implant in future medical treatment.

Biomechanical assessment of lumbar stability: finite element analysis of TLIF with a novel combination of coflex and pedicle screws

Meganathan S., Alphin M. S.

Acta of Bioengineering and Biomechanics

2023

Vol. 25, no. 4

133--143

Finite element analysis is frequently used for lumbar spine biomechanical analysis. The primary scope of this work is to illustrate, using finite element analysis, how the biomechanical behavior of the transforaminal lumbar interbody fusion (TLIF), along with a novel combination of the interspinous process device (IPD) and pedicle screws, improves lumbar spine stability. Methods: In this study, unilateral pedicle screw fixation (UPSF) and bilateral pedicle screw fixation (BPSF) were used. Four FE models were developed using ANSYS software, as follows: (1) Intact model; (2) TLIF with “U”-shaped Coflex-F IPD (UCF); (3) TLIF with Coflex-F and UPSF (UCF + UPSF); (4) TLIF with Coflex-F and BPSF (UCF + BPSF). The intact model was subjected to four pure moments (10 Nm), and the results were validated with previous literature data. The intact model results correlated well with the literature data, and the model was validated. Three surgical models were subjected to 7.5 Nm four pure moments, flexion (FL), extension (ET), lateral bending (LB), and axial rotation (AR) and a 280N follower load. Results: The surgical model results were compared with the intact model. The comprehensive analysis results show the UCF + BPSF surgical model gave a good advantage on range of motion, cage stress, Coflex-F stress and endplate stress compared among the two models. Conclusion: This study proposes that the UCF + BPSF system helps to reduce the stress on the implant and adjacent endplates and gives very good stability to the lumbar spine under the various static loading conditions.