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European Spine Journal

, Volume 28, Issue 6, pp 1413–1422 | Cite as

Molecular alterations of human lumbar yellow ligament related to the process of intervertebral disk degeneration and stenosis

  • Delio E. MartinsEmail author
  • Marcelo Wajchenberg
  • Juliana M. Veridiano
  • Thérèse R. Theodoro
  • Olga M. S. Toledo
  • Maria A. S. Pinhal
Original Article

Abstract

Purpose

The objective of this study was to analyze the layers of yellow ligament in lumbar canal stenosis and disk herniation.

Methods

Eighteen ligaments were harvested from patients with lumbar spinal canal stenosis. Twenty-nine normal samples from lumbar spine disk herniation patients served as control. All surgical procedures were the same. Ligaments were stained in hematoxylin and eosin; picrosirius–hematoxylin for collagen; Weigert’s resorcin-fuchsin for elaunin, oxytalan and elastic fibers; and transmission electron microscopy. Immunohistochemistry was performed for Il-6; Il-10; and CD-31, PGP9.5. Results are described in means and standard error (mean ± SE), and all analyses adopted the significance level of P < 0.05.

Results

Spinal stenosis ligaments were 2.5 × thicker. Control superficial ligaments presented a large number of thick, compact collagen fibers and a significant amount of oxytalan and mature elastic fibers. The deep layer presented a large number of mature elastic fibers. In the stenosis group, collagen was thinner and compacted in both layers. There was no difference in the interleukin profile among groups. The deep portion of the stenosis group presented a higher number of vessels and nerves.

Conclusion

Two layers compose the elastic system of the normal ligamentum flavum, where the deep portion is mainly responsible for its elasticity (elaunin fibers), while its resistance depends on the concentration of oxytalan fibers, which are more present in the superficial layer. Ligamentum flavum in the stenosis samples presents more mononuclear infiltrate and more degraded elastic fibers with a higher number of vessels in its deep portion.

Graphical abstract

These slides can be retrieved under Electronic Supplementary Material.

Keywords

Ligamentum flavum Spinal stenosis Elastic fibers Elaunin fibers Oxytalan fibers 

Notes

Acknowledgements

We thank Nelson Astur (Hospital Israelita Albert Einstein) for his assistance in collecting the samples. The authors are grateful to Professor Elia Garcia Caldini for his suggestions. Part of this work has been carried out in the Electron Microscopy Laboratory of Faculdade de Medicina da USP.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interest.

Supplementary material

586_2019_5994_MOESM1_ESM.pptx (6.3 mb)
Supplementary material 1 (PPTX 6493 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Universidade Federal de Sao Paulo – UNIFESPSao PauloBrazil
  2. 2.Hospital Israelita Albert EinsteinSao PauloBrazil
  3. 3.Faculdade de Medicina do ABC – FMABCSanto AndreBrazil
  4. 4.Universidade Anhembi MorumbiSao PauloBrazil

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