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Related Experiment Video

Updated: Jun 7, 2026

C-arm-Free Simultaneous OLIF51 and Percutaneous Pedicle Screw Fixation in a Single Lateral Position
12:25

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Published on: September 16, 2022

Pseudolisthesis secondary to small L5.

Mohammad Hadi Bagheri1, Mehrdad Mohammad Hosseini, Amin Aboulhassani Foroughi

  • 1Department of Radiology, Medical Imaging Research Center, Namazi Hospital, Shiraz University of Medical Sciences, Namazi Square, Shiraz 71936-13311, Iran. bagherih@sums.ac.ir

European Journal of Radiology
|November 2, 2010
PubMed
Summary

Small L5 anteroposterior diameter on lumbosacral MRI can mimic spondylolisthesis. This condition, termed pseudospondylolisthesis, occurs in about 2% of patients and is associated with spondylolysis.

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Published on: September 16, 2022

Area of Science:

  • Radiology
  • Orthopedics
  • Spine Imaging

Background:

  • Small anteroposterior (AP) diameter of the L5 vertebra can present as spondylolisthesis on lumbosacral magnetic resonance imaging (MRI).
  • This finding can lead to misdiagnosis if not properly identified.

Purpose of the Study:

  • To determine the prevalence of small L5 AP diameter mimicking spondylolisthesis in lumbosacral MRI.
  • To evaluate the association between small L5 AP diameter and the presence of spondylolysis.

Main Methods:

  • Retrospective analysis of 2000 lumbosacral MRI scans.
  • Identification of cases with a posterior step of L5 greater than 2 mm.
  • Evaluation for unilateral or bilateral spondylolysis in selected cases.

Main Results:

  • Small L5 AP diameters were found in 38 cases (2%), mimicking spondylolisthesis.
  • Prevalence of this finding in patients referred for any symptoms was approximately 2%.
  • Of these cases, 15.8% showed unilateral spondylolysis and 13.1% showed bilateral spondylolysis.

Conclusions:

  • Pseudospondylolisthesis due to small L5 AP diameter occurs in about 2% of lumbosacral MRIs and may be overlooked.
  • An association exists between a small L5 AP diameter and the presence of spondylolysis at L5.