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Lumbosacral transitional segments: classification, prevalence, and effect on disk height.

C Y Hsieh1, J D Vanderford, S R Moreau

  • 1Research Division, Los Angeles College of Chiropractic, Whittier, Calif., USA.

Journal of Manipulative and Physiological Therapeutics
|September 27, 2000
PubMed
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Lumbosacral transitional segments are uncommon in chiropractic settings. These anomalies, particularly with bony fusion, narrow the L5-S1 disk height, which is not indicative of degeneration.

Area of Science:

  • Chiropractic research
  • Radiographic analysis
  • Spinal anatomy

Background:

  • Lumbosacral transitional segments (LSTSs) are anatomical variations.
  • Understanding their prevalence and impact is crucial in chiropractic practice.

Purpose of the Study:

  • To determine the prevalence of LSTSs in chiropractic settings.
  • To assess the effect of LSTSs on lumbosacral intervertebral disk height.

Main Methods:

  • Retrospective review of lumbar spine radiographs.
  • Analysis of 882 lumbar series from a private practice and 786 from a college clinic.
  • Comparison of L5-S1 disk height in patients with and without LSTSs.

Main Results:

  • LSTSs were found in 2.3% of cases at the private office and 6.5% at the college clinic.

Related Experiment Videos

  • L5-S1 disk height was significantly smaller in patients with LSTSs (11% vs. 19%).
  • Bilateral L5-sacrum fusion further reduced L5-S1 disk height (8% vs. 12%-14%).

    • Conclusions:

    • The occurrence rate of LSTSs is low within chiropractic practice.
    • LSTSs, especially with bony fusion, lead to narrower L5-S1 disks.
    • Narrowing should not be mistaken for disk degeneration or displacement.