Evidence map›Paper›PMID 28785999›Full record

ArticleEuropean spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society2017

A more realistic disc herniation model incorporating compression, flexion and facet-constrained shear: a mechanical and microstructural analysis. Part I: Low rate loading.

Kelly R Wade, Meredith L Schollum, Peter A Robertson, Ashvin Thambyah, Neil D Broom

Abstract read
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In one paragraph

Article in European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 18 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
18citing papers in PubMed, 1 pooled it
2.2field-weighted citation impact, top 12% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

18 citing papers in PubMed, 1 synthesis or guideline pooled it, 35 citations in OpenAlex.

  1. Lumbar disc herniation modelling: a review of ex-vivo mechanical models and a comparison with clinical data.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2025
    Pooled it
  2. Biomechanical simulation of long-term performance of a tendon-based spinal stabilization (VPX).European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2026
    Article
  3. Article
  4. Can cervical disc herniations be provokedFrontiers in bioengineering and biotechnology · 2026
    Article
  5. Review
  6. Review
  7. Article
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  10. Endplate fractures with subtle structural damage in impact loaded flexed ovine lumbar segments: a potential initiator of disc degeneration.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2025
    Article
  11. Article
  12. The triadic relationship between spinal posture, loading, and degeneration.Frontiers in bioengineering and biotechnology · 2025
    Article
  13. Review
  14. Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 2 institutions in 1 country.

Kelly R WadeTissue Mechanics Laboratory, Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand.
Meredith L SchollumTissue Mechanics Laboratory, Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand. meredith.schollum@auckland.ac.nz.ORCID 0000-0002-4291-7330
Peter A RobertsonDepartment of Orthopaedic Surgery, Auckland Hospital, Auckland, New Zealand.
Ashvin ThambyahTissue Mechanics Laboratory, Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand.
Neil D BroomTissue Mechanics Laboratory, Department of Chemical and Materials Engineering, University of Auckland, Auckland, New Zealand.
University of Auckland · NZAuckland City Hospital · NZ

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeTo date, the mechanisms of disc failure have been explored at a microstructural level in relatively simple postures. However, in vivo the disc is known to be subjected to complex loading in compression, bending and shear, and the influence of these factors on the mechanisms of disc failure is yet to be described at a microstructural level. The purpose of this study was to provide a microstructural analysis of the mechanisms of failure in healthy discs subjected to compression while held in a complex posture incorporating physiological amounts of flexion and facet-constrained shear.

methods30 motion segments from 10 healthy mature ovine lumbar spines were compressed in a complex posture intended to simulate the situation arising when bending and twisting while lifting a heavy object, and at a displacement rate of 40 mm/min. Nine of the 30 samples reached the predetermined displacement prior to a reduction in load and were classified as early-stage failures, providing insight into initial areas of disc disruption. Both groups of damaged discs were then analysed microstructurally using light microscopy.

resultsComplex postures significantly reduced the load required to cause disc failure than earlier described for flexed postures [8.42 kN (STD 1.22 kN) compared to 9.69 kN (STD 2.56 kN)] and resulted in a very different failure morphology to that observed in either simple flexion or direct compression, involving infiltration of nucleus material in a circuitous path to the annular periphery.

conclusionThe complex posture as used in this study significantly reduced the load required to cause disc failure, providing further evidence that asymmetric postures while lifting should be avoided if possible.

Indexed as

AnimalsDisease Models, AnimalIntervertebral Disc DisplacementLiftingPostureSheepSpinal Cord CompressionWeight-BearingZygapophyseal JointAnnular disruptionComplex postureCompressionHerniationIntervertebral discMechanicsMechanism of herniationMicrostructural analysisOvine lumbar motion segmentsRadial fissure

Identifiers

PMID28785999
OpenAlexW2744533584

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.