Biomechanical assessment of new surgical method instead of kyphoplasty to improve the mechanical behavior of the vertebra: Micro finite element study
| Autor: | Seyed Aref Hosseini Faradonbeh, Nima Jamshidi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
musculoskeletal diseases
medicine.medical_specialty 0206 medical engineering 02 engineering and technology Finite element study Surgical methods 03 medical and health sciences 0302 clinical medicine medicine von Mises yield criterion Kyphoplasty Orthopedics and Sports Medicine Von mises stress Orthodontics Vertebroplasty business.industry Basic Study musculoskeletal system 020601 biomedical engineering Surgery Vertebra medicine.anatomical_structure Micro finite element modeling Hexagonal porous structure business 030217 neurology & neurosurgery Biomechanical assessment |
| Zdroj: | World Journal of Orthopedics |
| ISSN: | 2218-5836 |
| Popis: | AIM To reduce post treatments of kyphoplasty, as a common treatment for osteoporotic vertebrae. METHODS This study suggests a new method for treating vertebrae by setting the hexagonal porous structure instead of the rigid bone cement mass in the kyphoplasty (KP). The KP procedure was performed on the fresh ovine vertebra of the level L1. Micro finite element modeling was performed based on micro computed tomography of ovine trabecular cube. The hexagonal porous structure was set on one cube instead of the bone cement mass. For the implant designing, two geometrical parameters were considered: Spacing diameter and thickness. RESULTS The results of micro finite element analyses indicated the improvement in the mechanical behavior of the vertebra treated by the hexagonal porous structures, as compared to those treated by vertebroplasty (VP) and KP under static loading. The improvement in the mechanical behavior of the vertebra, was observed as 54% decrease in the amount of maximum Von Misses stress (improvement of stress distribution), in trabecular cube with embedded hexagonal structure, as compared to VP and KP. This is comparable to the results of the experimental study already performed; it was shown that the improvement of mechanical behavior of the vertebra was observed as: 83% increase in the range of displacements before getting to the ultimate strength (increasing the toughness) after setting hexagonal pearls inside vertebrae. Both the material and geometry of implant influenced the amount of Von Mises stress in the structure. CONCLUSION The new proposed method can be offered as a substitute for the KP. The implant geometry had a more obvious effect on the amount of Von Mises stress, as compared to the implant material. |
| Databáze: | OpenAIRE |
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