How maturity influences annulus-endplate integration in the ovine intervertebral disc: a micro- and ultra-structural study.

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dc.contributor.author Rodrigues, Samantha A en
dc.contributor.author Thambyah, Ashvin en
dc.contributor.author Broom, Neil en
dc.date.accessioned 2018-12-05T20:42:00Z en
dc.date.issued 2017-01 en
dc.identifier.issn 0021-8782 en
dc.identifier.uri http://hdl.handle.net/2292/44865 en
dc.description.abstract The annulus-endplate anchorage system plays a vital role in structurally linking the compliant disc to its adjacent much more rigid vertebrae. Past literature has identified the endplate as a region of weakness, not just in the mature spine but also in the immature spine. The aim of this structural study was to investigate in detail the morphological changes associated with annulus-endplate integration through different stages of maturity. Ovine lumbar motion segments were collected from two immature age groups: (i) newborn and (ii) spring lamb (roughly 3 months old); these were compared with a third group of previously analysed mature ewe samples (3-5 years). Sections from the posterior region of each motion segment were obtained for microstructural analysis and imaged in their fully hydrated state via differential interference contrast (DIC) optical microscopy. Selected slices were further prepared and imaged via scanning electron microscopy (SEM) to analyse fibril-level modes of integration. Despite significant changes in endplate morphology, the annular fibre bundles in all three age groups displayed a similar branching mechanism, with the main bundle splitting into several sub-bundles on entering the cartilaginous endplate. This morphology, previously described in the mature ovine disc, is thought to strengthen significantly annulus-endplate integration. Its prevalence from an age as young as birth emphasizes the critical role that it plays in the anchorage system. The structure of the branched sub-bundles and their integration with the surrounding matrix were found to vary with age due to changes in the cartilaginous and vertebral components of the endplate. Microscopically, the sub-bundles in both immature age groups appeared to fade into the surrounding tissue due to their fibril-level integration with the cartilaginous endplate tissue, this mechanism being particularly complex in the spring lamb disc. However, in the fully mature disc, the sub-bundles remained as separate entities throughout the full depth of their anchorage into the cartilaginous endplate. Cell morphology was also found to vary with maturity within the cartilaginous matrix and it is proposed that this relates to endplate development and ossification. en
dc.format.medium Print-Electronic en
dc.language eng en
dc.relation.ispartofseries Journal of anatomy en
dc.rights Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. en
dc.rights.uri https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm en
dc.subject Lumbar Vertebrae en
dc.subject Animals en
dc.subject Animals, Newborn en
dc.subject Sheep en
dc.subject Sheep, Domestic en
dc.subject Microscopy, Interference en
dc.subject Intervertebral Disc en
dc.subject Biomechanical Phenomena en
dc.title How maturity influences annulus-endplate integration in the ovine intervertebral disc: a micro- and ultra-structural study. en
dc.type Journal Article en
dc.identifier.doi 10.1111/joa.12536 en
pubs.issue 1 en
pubs.begin-page 152 en
pubs.volume 230 en
dc.rights.holder Copyright: The author en
dc.identifier.pmid 27535364 en
pubs.end-page 164 en
pubs.publication-status Published en
dc.rights.accessrights http://purl.org/eprint/accessRights/RestrictedAccess en
pubs.subtype Research Support, Non-U.S. Gov't en
pubs.subtype Journal Article en
pubs.elements-id 540052 en
pubs.org-id Engineering en
pubs.org-id Chemical and Materials Eng en
dc.identifier.eissn 1469-7580 en
pubs.record-created-at-source-date 2016-08-19 en
pubs.dimensions-id 27535364 en


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