TUHH Open Research
Help
  • Log In
    New user? Click here to register.Have you forgotten your password?
  • English
  • Deutsch
  • Communities & Collections
  • Publications
  • Research Data
  • People
  • Institutions
  • Projects
  • Statistics
  1. Home
  2. TUHH
  3. Publication References
  4. The effect of six degree of freedom loading sequence on the in-vitro compressive properties of human lumbar spine segments
 
Options

The effect of six degree of freedom loading sequence on the in-vitro compressive properties of human lumbar spine segments

Publikationstyp
Journal Article
Date Issued
2016-10-03
Sprache
English
Author(s)
Amin, Dhara B.  
Lawless, Isaac M.  
Sommerfeld, Dana  
Stanley, Richard M.  
Ding, Boyin  
Costi, John J.  
Institut
Biomechanik M-3  
TORE-URI
http://hdl.handle.net/11420/5704
Journal
Journal of biomechanics  
Volume
49
Issue
14
Start Page
3407
End Page
3414
Citation
Journal of Biomechanics 14 (49): 3407-3414 (2016-10-03)
Publisher DOI
10.1016/j.jbiomech.2016.09.009
Scopus ID
2-s2.0-84992499912
The complex, direction-dependent, poro-viscoelastic properties of the intervertebral disc (disc) suggest that investigations of the six degree of freedom (6DOF) behaviour may be susceptible to inter-test variation in mechanical response if the disc does not return to initial conditions between loading directions. No studies have quantified the effects of sequential multi-directional loading on the consistency of the compressive response of the disc throughout a 6DOF testing protocol. Therefore, the objective of this study was to determine the effect of 6DOF loading on the compressive properties (stiffness and phase angle) of human discs, as evaluated by a reference compression test performed after each single DOF test. Fourteen intact human functional spinal units (FSU) were tested in each of ±6DOFs (shear directions followed by bending and compression) across four orders of magnitude loading frequencies (0.001–1 Hz), followed by reference compression tests while subjected to physiological preload, hydration, and body temperature conditions in a hexapod robot. Repeated measures ANOVA revealed significant within-subjects effects between the reference compression tests for modulus (p<0.001), stiffness (p<0.001), and phase angle (p=0.008). Significant post-hoc pairwise comparisons were initially seen between the control and other reference compression tests for stiffness and modulus after the shear DOFs, however, no significant differences were present after the final reference compression test compared to control. More pronounced effects were seen for stiffness in comparison to modulus and phase angle. These effects may be due to three potentials factors, which include the sequence of testing, the cohort of degenerative specimens, and/or cumulative creep due to the constant application of a follower load. While the sequence of test directions was chosen to minimise the biphasic effect, there may be other sequences, which could result in minimal changes in compressive properties.
Subjects
Biomechanics
Compression
Intervertebral disc
Load history
Mechanical properties
Six degree of freedom
DDC Class
620: Ingenieurwissenschaften
TUHH
Weiterführende Links
  • Contact
  • Send Feedback
  • Cookie settings
  • Privacy policy
  • Impress
DSpace Software

Built with DSpace-CRIS software - Extension maintained and optimized by 4Science
Design by effective webwork GmbH

  • Deutsche NationalbibliothekDeutsche Nationalbibliothek
  • ORCiD Member OrganizationORCiD Member Organization
  • DataCiteDataCite
  • Re3DataRe3Data
  • OpenDOAROpenDOAR
  • OpenAireOpenAire
  • BASE Bielefeld Academic Search EngineBASE Bielefeld Academic Search Engine
Feedback