A comparison of stress-induced porosity due to conventional and a modified spinal fixation device
| Autor: | John M. Winterbottom, Brett Kessler, James Neil Weinstein, Jong K. Gwon, Tae-Hong Lim, Joon B. Park, Vijay K. Goel, Jae Y. Ahn |
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| Rok vydání: | 1994 |
| Předmět: |
Male
medicine.medical_specialty Bone Screws Fixation (surgical) Cicatrix Dogs Osseointegration medicine Animals Volumetric density Porosity Rachis Bone growth Wound Healing Lumbar Vertebrae business.industry Stress induced Biomechanics Equipment Design medicine.disease Internal Fixators Surgery Biomechanical Phenomena Osteopenia Bone Diseases Metabolic Spinal Fusion Female Neurology (clinical) Stress Mechanical business Bone Plates Biomedical engineering Electron Probe Microanalysis |
| Zdroj: | Journal of spinal disorders. 7(1) |
| ISSN: | 0895-0385 |
| Popis: | A hypothesis that device-related osteopenia can be reduced by decreasing the rigidity of a fixation device was tested through a canine study. Polymer washers were interposed between the integral nut and plate of the variable spinal plating (VSP) system to reduce its rigidity. A solid fusion was observed 6 months postoperatively in all of the animals using VSP or modified systems. The stabilized segment using both systems showed similar load-displacement behaviors immediately after surgery and 6 months postoperatively. Although not significant, 5.6 and 1.8% decreases in volumetric density of mineralized bone were found in the stabilized segments due to VSP and modified systems, respectively. The modified system also increased bone growth around screws. The new concept of using polymer washers, to decrease rigidity of the fixation device over time, may reduce device-related osteopenia. |
| Databáze: | OpenAIRE |
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