The effect of angled insertion on halo pin fixation.
Spine (Phila Pa 1976)
; 14(8): 781-3, 1989 Aug.
Article
em En
| MEDLINE
| ID: mdl-2781390
This study evaluated the effect of angled insertion of halo pins on the biomechanical characteristics of the halo pin-calvarium complex. Halo pins were inserted into isolated calvarium sections at 90 degrees, 75 degrees, and 60 degrees to the surface of the bone at an insertional torque of 0.68 N-m (6 inch-pounds). Initial rigidity, load at failure, and deformation at failure of the pin-bone complex were assessed during transverse shear loading. The structural properties of the pin-bone complex were maximized at loads approaching failure when pins were inserted perpendicular (90 degrees) to the bony surface and significantly decreased at more acute angles of insertion. Perpendicular insertion of halo pins maximizes the structural properties of the complex formed by the halo pin and the calvarium. This improved structural behavior may minimize the incidence of pin loosening clinically, and may reduce the frequency of other complications currently associated with the use of the halo orthosis.
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Bases de dados:
MEDLINE
Assunto principal:
Dispositivos de Fixação Ortopédica
/
Crânio
/
Pinos Ortopédicos
Limite:
Humans
Idioma:
En
Revista:
Spine (Phila Pa 1976)
Ano de publicação:
1989
Tipo de documento:
Article