Biomechanical Comparison of Locking Compression Plate versus Positive Profile Pins and Polymethylmethacrylate for Stabilization of the Canine Lumbar Vertebrae.
Vet Surg
; 45(3): 309-18, 2016 Apr.
Article
en En
| MEDLINE
| ID: mdl-27007649
ABSTRACT
OBJECTIVE:
To compare the stiffness, angular deformation, and mode of failure of lumbar vertebral column constructs stabilized with bilateral pins and polymethylmethacrylate (Pin-PMMA) or with a unilateral (left) locking compression plate (LCP) with monocortical screws. STUDYDESIGN:
Ex vivo biomechanical, non-randomized. SAMPLES Cadaveric canine thoracolumbar specimens (n=16).METHODS:
Thoracolumbar (T13-L3) vertebral specimens had the L1-L2 vertebral motion unit stabilized with either Pin-PMMA or LCP. Stiffness in flexion, extension, and right and left lateral bending after nondestructive testing were compared between intact (pretreated) specimens and Pin-PMMA, and LCP constructs. The Pin-PMMA and LCP constructs were then tested to failure in flexion and left lateral bending.RESULTS:
Both the Pin-PMMA and LCP constructs had reduced range of motion at the stabilized L1-L2 vertebral motion unit compared to intact specimens. The Pin-PMMA constructs had less range of motion for the flexion elastic zone than LCP constructs. The Pin-PMMA constructs were stiffer than intact specimens in flexion, extension, and lateral bending, and stiffer than LCP constructs in flexion and left lateral bending. The Pin-PMMA constructs had less angular deformation at construct yield and lower residual deformation at L1-L2 than LCP constructs after destructive testing to failure in flexion. The Pin-PMMA constructs were stiffer, stronger, and had less deformation at yield than LCP constructs after destructive testing to failure in lateral bending. Most constructs failed distant to the implant and fixation site.CONCLUSIONS:
Pin-PMMA constructs had greater lumbar vertebral stiffness and reduced ROM than LCP constructs; however, both Pin-PMMA and LCP constructs were stronger than intact specimens.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Clavos Ortopédicos
/
Placas Óseas
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Fracturas de la Columna Vertebral
/
Perros
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Vértebras Lumbares
Tipo de estudio:
Evaluation_studies
Límite:
Animals
Idioma:
En
Revista:
Vet Surg
Año:
2016
Tipo del documento:
Article