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How Static and Cyclic Loading Affect the Mechanical Properties of the Porcine Annulus Fibrosus.
Neptune, Andra; McMorran, John G; Gregory, Diane E.
Afiliación
  • Neptune A; Department of Kinesiology and Physical Education, Wilfrid Laurier University, 75 University Avenue West, Waterloo, ON N2L 3C5, Canada.
  • McMorran JG; Department of Kinesiology and Physical Education, Wilfrid Laurier University, 75 University Avenue West, Waterloo, ON N2L 3C5, Canada.
  • Gregory DE; Department of Kinesiology and Physical Education, Wilfrid Laurier University, 75 University Avenue West, Waterloo, ON N2L 3C5, Canada; Department of Health Sciences, Wilfrid Laurier University, 75 University Avenue West, Waterloo, ON N2L 3C5, Canada.
J Biomech Eng ; 146(11)2024 Nov 01.
Article en En | MEDLINE | ID: mdl-38949883
ABSTRACT
This study sought to evaluate the effects of prolonged cyclic loading on the tissue-level mechanical properties of the spinal annulus fibrosus. Functional spinal units (FSUs) were obtained from porcine cervical spines at the C3-C4 and C5-C6 levels. Following a 15-min preload of 300 N of axial compression, the FSUs were split into three groups the cyclic loading group cycled between 0.35 MPa and 0.95 MPa for 2 h (n = 8); the static loading group was compressed at 0.65 MPa for 2 h (n = 10); and a control group which only underwent the 300 N preload (n = 11). Following loading, samples of the annulus were excised to perform intralamellar tensile testing and interlamellar 180 deg peel tests. Variables analyzed from the intralamellar test were stress and strain at the end of the toe region, stress and strain at initial failure (yield point), Young's modulus, ultimate stress, and strain at ultimate stress. Variables evaluated from the interlamellar tests were lamellar adhesion strength, adhesion strength variability, and stiffness. The analysis showed no significant differences between conditions on any measured variable; however, there was a trend (p = 0.059) that cyclically loaded tissues had increased adhesion strength variability compared to the static and control conditions. The main finding of this study is that long-duration axial loading did not impact the intra- or interlamellar mechanical properties of the porcine annulus. A trend of increased adhesion strength variability in cyclically loaded samples could indicate a potential predisposition of the annulus to delamination.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Estrés Mecánico / Soporte de Peso / Anillo Fibroso Límite: Animals Idioma: En Revista: J Biomech Eng Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Estrés Mecánico / Soporte de Peso / Anillo Fibroso Límite: Animals Idioma: En Revista: J Biomech Eng Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos