| Autor: |
Bianca F, Hettlich, Matthew J, Allen, Gabriela S, Glucksman, Geoffrey T, Fosgate, Alan S, Litsky |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Veterinary surgery : VS. 43(8) |
| ISSN: |
1532-950X |
| Popis: |
To determine the biomechanical effect of an intervertebral spacer on construct stiffness in a PVC model and cadaveric canine cervical vertebral columns stabilized with monocortical screws/polymethylmethacrylate (PMMA).Biomechanical study.PVC pipe; cadaveric canine vertebral columns.PVC model-PVC pipe was used to create a gap model mimicking vertebral endplate orientation and disk space width of large-breed canine cervical vertebrae; 6 models had a 4-mm gap with no spacer (PVC group 1); 6 had a PVC pipe ring spacer filling the gap (PCV group 2). Animals-large breed cadaveric canine cervical vertebral columns (C2-C7) from skeletally mature dogs without (cadaveric group 1, n = 6, historical data) and with an intervertebral disk spacer (cadaveric group 2, n = 6) were used. All PVC models and cadaver specimens were instrumented with monocortical titanium screws/PMMA. Stiffness of the 2 PVC groups was compared in extension, flexion, and lateral bending using non-destructive 4-point bend testing. Stiffness testing in all 3 directions was performed of the unaltered C4-C5 vertebral motion unit in cadaveric spines and repeated after placement of an intervertebral cortical allograft ring and instrumentation. Data were compared using a linear mixed model approach that also incorporated data from previously tested spines with the same screw/PMMA construct but without disk spacer (cadaveric group 1).Addition of a spacer increased construct stiffness in both the PVC model (P .001) and cadaveric vertebral columns (P .001) compared to fixation without a spacer.Addition of an intervertebral spacer significantly increased construct stiffness of monocortical screw/PMMA fixation. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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