Shear strength of the human lumbar spine

Clinical Biomechanics
Daniel M SkrzypiecGerd Huber

Abstract

Shear loading is recognised as a risk factor for lower back pain. Previous studies of shear loading have either not addressed the influence of age, bone mineral density, axial height loss due to creep or were performed on animal specimens. Intact human lumbar motion segments (L2-3) were tested in shear using a modified materials testing machine, while immersed in a Ringer bath at 37°C. Vertebrae were rigidly embedded in neutral posture (0° flexion) and subjected to a constant axial compression load of 500 N. Shear was applied to three groups: 'Young-No-Creep' (20-42 years), 'Young-Creep' (22-38 years, creep 1000 N for 1h) and 'Old-No-Creep' (44-64 years). Failure was induced by up to 15 mm of anterior shear displacement at a rate of 0.5mm/s. The trabecular and apophyseal joint bone mineral densities were evaluated from computed tomography images of the intact lumbar spines. Peak shear force correlated positively with trabecular bone mineral density for specimens tested without axial creep. No significant differences were observed with respect to age. During shear overload specimens increased in height in the axial direction. Trabecular bone mineral density can be used to predict the peak force of lumbar spine in shear in neutra...Continue Reading

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Citations

Sep 10, 2013·Clinical Biomechanics·Miklós F IvicsicsGerd Huber
Jan 15, 2013·Journal of Biomechanics·Daniel M SkrzypiecGerd Huber
Aug 21, 2013·Journal of Biomechanics·Hendrik SchmidtAboulfazl Shirazi-Adl
Sep 15, 2014·International Archives of Occupational and Environmental Health·Massimo BovenziMarcella Mauro
Feb 3, 2016·Industrial Health·Daniel M SkrzypiecGerd Huber
Jul 30, 2014·Journal of Biomechanical Engineering·Jeffrey B BarkerNaveen Chandrashekar
Jun 6, 2020·Sports Biomechanics·Maria SjöbergOla Eiken

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