Cz En

Musculoskeletal system and artificial replacements

FEM biomechanical analysis of the lower cervical spine (C4-C6)

Project description:

Interactions of the individual spinal segments

FE model of the cervical spine (C4-C6) after the artificial disc replacement implantation

Maximal reduced stress [MPa] in flexion

Maximal reduced stress [MPa] in extension

The objective of this study is a kinematic biomechanical analysis (ROM) of lower cervical spine using four types of artificial mobile disc replacement (Prodisc-C; Synthes, Prestige; Medtronic, Mobi-C; Mediform, Activ-C; BBraun) and two most often used surgical techniques (without ALL/with PLL, without ALL/without PLL). In terms of this study I developed a functional 3D FE model of the lower cervical spine column (C4-C6), which corresponds to geometrical and material properties of human cervical spine. The complex geometry of the spine was created using computer tomography (CT) images. 3D geometrically model consists of three vertebrae and two intervertebral discs. After that was the model exported to FEM software and the initial parameters used for analysis were defined (material properties, boundary condition, interactions, loads,step and type of mesh). Ligaments, which essentially influence a spinal movement were preserved. However,  muscles were removed.  The results of validated model by loading (1 mm axial displacement and combination 1,8 Nm/73,6 N in direction flexion/extension) were in good agreement with published data. The loading  of 1,5 Nm in direction flexion/extension, 1 Nm lateral bending and axial rotation was used for the general kinematic analysis. The physiological state of spine (intact, fused and after implantation) were compared in this study.

FE model will be used for validation of surgical approaches including the planning of surgical intervention. The output data will be used for effective treatment of the patients with degenerative changes in the spinal part. The achieved results have a large medical impact on neurology and spine surgery.


FH Motol, prof. Jan Stulik, MUDr. Tomas Vyskocil