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Vol.21, No.1, 2021, pp. 65–83 |
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BIOMECHANICAL COMPARISON OF THREE TOTAL ARTIFICIAL DISCS: SB-CHARITE III®, PRODISC-L® AND MAVERICK® REINFORCED BY A POSTERIOR FIXATION SYSTEM IN THE SPINAL COLUMN: A THREE-DIMENSIONAL FINITE ELEMENT ANALYSIS Amar Chemmami1, Benaoumer Aour1, Samir Zahaf2, Mouloud Dahmane3, Izzeddine Bekkar2, Ghalem Mehdi2, Djilali Boutchicha3 1) Deparment. of Mechanical Eng., National Polytechnic School of Oran, Oran, ALGERIA email: chemmami.amarr@gmail.com 2) Department of Technology, University of Djilali Bounaama- Khamis Meliana, Ain Defla, ALGERIA email: samir.zahaf@univ-dbkm.dz , zahafsamir1983@gmail.com 3) LMA, Department of Mechanical Engineering, USTO-MB, Oran, ALGERIA email: dahmanemoul@gmail.com
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Abstract The purpose of this study is to investigate the biomechanical effects of three different types of artificial discs (Maverick®, Charite III®, Prodisc L®) to adjacent segments and implanted in the lumbar spine (S1-L5), decrease the stress level and the strains at the level of disc D2 between the two lumbar segments (L5-L4), the cortical and the cancellous bone of the lumbar vertebra L5 and by using a finite element model (FEM). In other words, we installed these discs between the two vertebral segments (S1-L5), (L5-L4) of the spine. To ensure the stability of the spine and avoid slipping, we installed a posterior fixation system (6 screws plus 2 rods) at the level pedicle of the lumbar vertebra (S1-L5, L5-L4). The validated intact spine model is tested after implantation of three artificial discs at (S1-L5). Each implanted model is subjected to a combination of 134 N of compression load P1 and two bending moments (P2, P3). ANSYS WORKBENCH version 16.2 is used for the mesh and analysis of the geometry of the intact and implanted models. Numerical results show that the level of stress decreases in disc D2. These artificial discs play a very important role in the absorption of stresses and to minimize, on the other hand, the two artificial discs (SB-Charite III®, Prodisc-L®) also play an important role in reducing stress in the cortical and cancellous bone of the L5 vertebra, compared to the other artificial disc (Maverick®). We conclude that the three types of disc prostheses (Maverick®, SB-Charite III®, Prodisc-L®) implanted at level (S1-L5) show a lower level of Von Mises stress at disc level D2, cortical and cancellous bone of the vertebra L5 to that measured with the intact model. In general, the three disc prostheses reinforced with a posterior fixation system give a lower level of stress in the disc D2, between the two lumbar segments (L5-L4), compared to the healthy disc (D2). Keywords: vertebral column, ligaments, artificial discs, total disc replacement, finite element method (FEM), Maverick®, SB-Charite® III, Prodisc-L® |
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full article (3.16 MB)
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