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[Pathological studies on the lumbar facet joints].

M Sato1

  • 1Department of Orthopaedic Surgery, School of Medicine, Chiba University, Japan.

Nihon Seikeigeka Gakkai Zasshi
|November 1, 1991
PubMed
Summary
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Lumbar facet joint remodeling involves bony architecture changes, particularly in sagittally oriented and degenerated joints. Degenerative changes may initiate from calcification at the ligamentum flavum attachment site.

Area of Science:

  • Orthopedics
  • Anatomy
  • Biomechanics

Background:

  • Facet joint degeneration is a common cause of low back pain.
  • Understanding the relationship between bony architecture and remodeling is crucial for diagnosing and treating facet joint osteoarthritis.

Purpose of the Study:

  • To investigate the relationship between bony architecture changes and remodeling processes in human lumbar facet joints.
  • To correlate facetal angle and subchondral bone volume with disc degeneration and joint remodeling.

Main Methods:

  • Microradiography was used to analyze bony architecture and remodeling in cadaveric lumbar spine specimens.
  • Facetal angles were measured at different lumbar levels (L1-L5).
  • Subchondral compact bone volume and trabecular mineralization were assessed.

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Main Results:

  • Facetal angles increased from L1-2 to L4-5.
  • Higher subchondral compact bone volume was observed in the anterior facet regions.
  • Increased compact bone volume correlated with more sagittal facet orientation, asymmetry, and disc degeneration.
  • Degenerative facets showed highly mineralized trabecular tissues, indicative of old calcified fibrocartilage from remodeling.

Conclusions:

  • Lumbar facet joint degeneration is associated with specific bony architectural features and remodeling patterns.
  • Facetal orientation, asymmetry, and disc degeneration influence subchondral bone remodeling.
  • Degenerative changes likely begin with calcification at the ligamentum flavum attachment, leading to new bone formation and joint transformation.