On the biomechanical significance of inter-lamellar interfaces in the intervertebral disc
Adam, Clayton, Rouch, Philippe, & Skalli, Wafa (2015) On the biomechanical significance of inter-lamellar interfaces in the intervertebral disc. In Shrive, Nigel G. & Middleton, John (Eds.) Computer Methods in Biomechanics and Biomedical Engineering 2015, 1-5 September 2015, Montreal, Quebec, Canada. (Unpublished)
The intervertebral disc (IVD) is a unique soft tissue structure which provides structural support and flexibility in the axial skeleton of vertebrates. From a structural perspective, the disc behaves somewhat like a thick walled pressure vessel, where the walls are comprised of a series of composite annular rings (lamellae). However, a prior study (Marchand and Ahmed, 1990) found a high proportion of circumferentially discontinuous lamellae in human lumbar IVDs. The presence of these discontinuities raises important structural questions, because discontinuous lamellae cannot withstand high nucleus pressures via the generation of circumferential (hoop) stress. A possible alternative mechanism may be that inter-lamellar cohesion allows shear stress transfer between adjacent annular layers. The aim of the present study was therefore to investigate the importance of inter-lamellar shear resistance in the intervertebral disc. This work found that inter-lamellar shear resistance has a strong influence on the compressive stiffness of the intervertebral disc, with a change in interface condition from tied (no slip) to frictionless (no shear resistance) reducing disc compressive stiffness by 40%. However, it appears that substantial inter-lamellar shear resistance is present in the bovine tail disc. Decreases in inter-lamellar shear resistance due to degradation of bridging collagenous or elastic fibre structures could therefore be an important part of the process of disc degeneration.
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|Item Type:||Conference Item (Presentation)|
|Keywords:||disc lamellae, intervertebral disc, inter-lamellar cohesion, inter-lamellar shear, compressive stiffness, disc stiffness, bovine, bovine disc, disc degeneration|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomechanical Engineering (090302)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CLINICAL SCIENCES (110300) > Orthopaedics (110314)
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Copyright Owner:||Copyright 2015 The Authors|
|Deposited On:||23 Sep 2015 03:09|
|Last Modified:||26 Sep 2015 18:38|
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