Therefore, there is little risk of permanent implant deformation or severe damage under normal loading conditions. 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. ![]() 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. We studied three options: intact spine, nucleotomy, and nucleus implant. All materials were assumed homogeneous, isotropic, and linearly elastic. Methods: The ANSYS lumbar spine model made from lumbar spine X-rays and magnetic resonance images obtained from cadaveric spine specimens were used. ![]() Objective: To validate a Bionate 80A ring-shaped nucleus replacement. Study design: Biomechanical study of a nucleus replacement with a finite element model.
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