Finite element analysis of a Bionate ring-shaped customized lumbar disc nucleus prosthesis
| Autor: | Amparo Vanaclocha-Saiz, Vicente Vanaclocha, Carlos M. Atienza, Pablo Clavel, Pablo Jorda-Gomez, Carlos Barrios, Leyre Vanaclocha |
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| Rok vydání: | 2022 |
| Předmět: |
finite element model
Lumbar Vertebrae INGENIERIA MECANICA Biochemistry (medical) Finite Element Analysis Biomedical Engineering Artificial Limbs General Chemistry motion preservation Article Biomechanical Phenomena Biomaterials disc hernia polycarbonate urethane degenerative disc disease Humans Cirurgia Aparells i instruments Range of Motion Articular nucleus disc replacement |
| Zdroj: | Vanaclocha-Saiz, Amparo Vanaclocha Vanaclocha, Vicente Atienza Vicente, Carlos M. Clavel, Pablo Jordá Gómez, P. Barrios, Carlos Vanaclocha, Leyre 2022 Finite element analysis of a Bionate ring-shaped customized lumbar disc nucleus prosthesis Acs Biomaterials-Science & Engineering 17 5(1) 172 182 ACS Applied Bio Materials |
| Popis: | [EN] Study design: Biomechanical study of a nucleus replacement with a finite element model. Objective: To validate a Bionate 80A ring-shaped nucleus replacement. Methods: The ANSYS lumbar spine model made from lumbar spine X-rays and magnetic resonance images obtained from cadaveric spine specimens were used. All materials were assumed homogeneous, isotropic, and linearly elastic. We studied three options: intact spine, nucleotomy, and nucleus implant. Two loading conditions were evaluated at L-3-L-4, L-4-L-5, and L-5-S-1 discs: a 1000 N axial compression load and this load after the addition of 8 Nm flexion moment in the sagittal plane plus 8 Nm axial rotation torque. Results: Maximum nucleus implant axial compression stresses in the range of 16-34 MPa and tensile stress in the range of 5-16 MPa, below Bionate 80A resistance were obtained. Therefore, there is little risk of permanent implant deformation or severe damage under normal loading conditions. Nucleotomy increased segment mobility, zygapophyseal joint and end plate pressures, and annulus stresses and strains. All these parameters were restored satisfactorily by nucleus replacement but never reached the intact status. In addition, annulus stresses and strains were lower with the nucleus implant than in the intact spine under axial compression and higher under complex loading conditions. Conclusions: Under normal loading conditions, there is a negligible risk of nucleus replacement, permanent deformation or severe damage. Nucleotomy increased segmental mobility, zygapophyseal joint pressures, and annulus stresses and strains. Nucleus replacement restored segmental mobility and zygapophyseal joint pressures close to the intact spine. End plate pressures were similar for the intact and nucleus implant conditions under both loading modes. Manufacturing customized nucleus implants is considered feasible, as satisfactory biomechanical performance is confirmed. This project received funding from the European Union's 6th Framework Programme under project number IP 026599-s. |
| Databáze: | OpenAIRE |
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