Publisher DOI: 10.2486/indhealth.2015-0162
Title: Failure of the human lumbar motion-segments resulting from anterior shear fatigue loading
Language: English
Authors: Skrzypiec, Daniel M. 
Nagel, Katrin 
Sellenschloh, Kay 
Klein, Anke 
Püschel, Klaus 
Morlock, Michael 
Huber, Gerd 
Issue Date: 30-Jan-2016
Source: Industrial Health 4 (54): 308-314 (2016)
Journal or Series Name: Industrial health 
Abstract (english): An in-vitro experiment was designed to investigate the mode of failure following shear fatigue loading of lumbar motion-segments. Human male lumbar motion-segments (age 32-42 years, n=6) were immersed in Ringer solution at 37°C and repeatedly loaded, using a modified materials testing machine. Fatigue loading consisted of a sinusoidal shear load from 0 N to 1,500 N (750 N ± 750 N) applied to the upper vertebra of the motion-segment, at a frequency of 5 Hz. During fatigue experiments, several failure events were observed in the dynamic creep curves. Post-test x-ray, CT and dissection revealed that all specimens had delamination of the intervertebral disc. Anterior shear fatigue predominantly resulted in fracture of the apophyseal processes of the upper vertebrae (n=4). Exposure to the anterior shear fatigue loading caused motion-segment instability and resulted in vertebral slip corresponding to grade I and ‘mild’ grade II spondylolisthesis, as observed clinically.
ISSN: 1880-8026
Institute: Biomechanik M-3 
Type: (wissenschaftlicher) Artikel
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