Titanium-alloy enhances bone-pedicle screw fixation: mechanical and histomorphometrical results of titanium-alloy versus stainless steel
| Autor: | F. Sejling, Søren Overgaard, Cody Bünger, Finn B. Christensen, M. Dalstra |
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| Rok vydání: | 2000 |
| Předmět: |
Torsion
musculoskeletal diseases medicine.medical_specialty Swine Pull-out test medicine.medical_treatment Bone Screws chemistry.chemical_element Bone and Bones Stainless steel Fixation (surgical) medicine Animals Orthopedics and Sports Medicine Pedicle screw fixation Pedicle screw Signal interference Titanium Histomorphometry Lumbar Vertebrae business.industry Torsion (mechanics) Titanium alloy Stainless Steel musculoskeletal system equipment and supplies Biomechanical Phenomena Surgery Disease Models Animal Spinal Fusion surgical procedures operative chemistry Spinal fusion Female Original Article business Biomedical engineering |
| Zdroj: | Christensen, F B, Dalstra, M, Sejling, F, Overgaard, S & Bünger, C 2000, ' Titanium-alloy enhances bone-pedicle screw fixation: mechanical and histomorphometrical results of titanium-alloy versus stainless steel ' European Spine Journal, s. 97-103 . Christensen, F B, Dalstra, M, Sejling, F, Overgaard, S & Bünger, C 2000, ' Titanium-alloy enhances bone-pedicle screw fixation : Mechanical and histomorphometrical results of titanium-alloy versus stainless steel ', European Spine Journal, vol. 9, no. 2, pp. 97-103 . https://doi.org/10.1007/s005860050218 |
| ISSN: | 1432-0932 0940-6719 |
| DOI: | 10.1007/s005860050218 |
| Popis: | Several types of pedicle screw systems have been utilized to augment lumbar spine fusion. The majority of these systems are made of stainless steel (Ss), but titanium-alloy (Ti-alloy) devices have recently been available on the market. Ti-alloy implants have several potential advantages over Ss ones. High bioactivity and more flexibility may improve bone ingrowth and mechanical fixation, and the material also offers superior magnetic resonance imaging (MRI) and computed tomography (CT) resolution and significantly less signal interference. However, no data are available from loaded spinal constructs regarding bony ingrowth and mechanical fixation. The aim of this study was to analyse the effect of Ti-alloy versus Ss pedicle screws on mechanical fixation and bone ingrowth in a loaded mini-pig model. Eighteen adult mini-pigs underwent total laminectomy and posterolateral spinal fusion at L3-L4, and were randomly selected to receive either Ss (n = 9) or Ti (n = 9) pedicle screw devices. In both groups, the device used was compact Cotrel-Dubousset instrumentation (Sofamore Danek) of an identical size and shape. The postoperative observation time was 3 months. Screws from L3 were used for histomorphometric studies. Mechanical testing (torsional tests and pull-out tests) was performed on the screws from L4. The Ti screws had a higher maximum torque (P < 0.05) and angular stiffness (P < 0.07), measured by torsional testing. In the pull-out tests, no differences were found between the two groups with respect to the maximum load, stiffness and energy to failure. No correlation between removal torque and the pull-out strength was found (r = 0.1). Bone ongrowth on Ti was increased by 33% compared with Ss (P < 0.04), whereas no differences in bone volume around the screws were shown. Mechanical binding at the bone-screw interface was significantly greater for Ti pedicle screws than for Ss, which was explained by the fact that Ti screws had a superior bone ongrowth. There was no correlation between the screw removal torque and the pull-out strength, which indicates that the peripheral bone structure around the screw was unaffected by the choice of metal. |
| Databáze: | OpenAIRE |
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