Mechanical performance in axial compression of a titanium polyaxial locking plate system in a fracture gap model.
Vet Comp Orthop Traumatol
; 28(2): 88-94, 2015.
Article
em En
| MEDLINE
| ID: mdl-25703709
ABSTRACT
OBJECTIVE:
To evaluate the bending strength of the VetLOX® polyaxial locking plate system. MATERIALS ANDMETHODS:
Thirty-five 3.5 mm 12-hole titanium VetLOX® plates were used to stabilize seven different construct designs in a 1 cm fracture gap simulation model. Each construct was subjected to axial compression. Mean bending stiffness (BS) and yield load (YL) of each construct design were analysed using a one-way ANOVA and Tukey post-hoc analysis. Screw angulation was measured on reconstructed computed tomography (CT) images.RESULTS:
Reducing plate working length for fixed-angle constructs significantly increased BS (p <0.01) and YL (p <0.01). For a constant plate working length, increasing screw number did not significantly affect BS (p = 1.0) or YL (p = 0.86). Screw angulation measurement technique was validated by intra-class correlation coefficients (ICC) (ICC >0.9 for inter- and intra-observer measurements). An average screw angle of 13.2° did not significantly affect mechanical performance although incomplete screw head-plate engagement was noted on some reconstructed CT images when angulation exceeded 10°. Prefabricated screw-head inserts did not significantly increase mechanical performance. A 4 mm bone-plate stand-off distance significantly reduced BS and YL by 63% and 69% respectively. CLINICAL RELEVANCE The VetLOX® system allows the benefits of polyaxial screw insertion whilst maintaining comparable bending properties to fixed angle insertion. The authors recommend accurate plate contouring to reduce the risk of plate bending.Palavras-chave
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Base de dados:
MEDLINE
Assunto principal:
Titânio
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Placas Ósseas
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Teste de Materiais
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Fraturas Ósseas
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Modelos Biológicos
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article