Width of the Cervical Intervertebral Neuroforamina After Total Disc Replacement with the Cerkinetic Prosthesis: A Three-Dimensional Simulation Using a Computer-Aided Design Model
| Autor: | Richard Bostelmann, Hans Jakob Steiger, Michael Tauber, Mario Leimert |
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| Rok vydání: | 2013 |
| Předmět: |
Models
Anatomic Total Disc Replacement Facet (geometry) Kinematics Prosthesis Design law.invention Prosthesis Implantation User-Computer Interface law Humans Medicine Computer Simulation Range of Motion Articular Intervertebral Disc Intervertebral foramen Bearing (mechanical) business.industry Intervertebral disc Prostheses and Implants Anatomy medicine.anatomical_structure Cervical Vertebrae Computer-Aided Design Surgery Neurology (clinical) Tomography Tomography X-Ray Computed business Range of motion Cervical vertebrae Biomedical engineering |
| Zdroj: | Journal of Neurological Surgery Part A: Central European Neurosurgery. 74:205-208 |
| ISSN: | 2193-6323 2193-6315 |
| DOI: | 10.1055/s-0033-1347968 |
| Popis: | Introduction Physiological cervical intervertebral motion inherently induces a neuroforaminal volume change. Integration of an artificial motion component within this intervertebral kinematic system may cause neuroforamina to lose their ability for continuous and instantaneous volume adaptation, inducing foraminal stenosis. The purpose of the current study is to virtually simulate a newly developed cervical total disc replacement (TDR) to evaluate the neuroforaminal dimensions at rest and during motion. Materials and Methods In a three-dimensional computer-aided design model of the spine, the Cerkinetic (OrthoKinematica Ltd., Haifa, Israel) TDR was virtually implanted at the C5–C6 disc space. The TDR consists of a bearing mechanism with an elliptical protuberance and a recess, allowing a progressive increase of the intervertebral axial spacing in all three dimensions and in line with flexion and extension. Translations are performed in accordance with the physiological forces influencing the disc space and spinal continuum. The minimal proximal neuroforaminal width was defined and evaluated at rest and motion. Results A progressive increase (15.2% at 6 degrees) in flexion and a decrease (12.3% at 6 degrees) in extension of the neuroforaminal width were observed. With axial motion, a progressive increase (44.6% at 6 degrees) of the right neuroforamen width as well as a decrease of the left neuroforamen width (15.3% at 6 degrees) were seen. Conclusion The TDR under investigation simulates the intervertebral kinematics, allowing a physiological adjustment of the facet joints in rest and motion. This preserves the ability of the neuroforamina to maintain their capability of changing their dimensions. |
| Databáze: | OpenAIRE |
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