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European Spine Journal

, Volume 22, Issue 9, pp 1965–1971 | Cite as

MRI features of the psoas major muscle in patients with low back pain

  • Juraj ArbanasEmail author
  • Ivan Pavlovic
  • Verner Marijancic
  • Hrvoje Vlahovic
  • Gordana Starcevic-Klasan
  • Stanislav Peharec
  • Snjezana Bajek
  • Damir Miletic
  • Daniela Malnar
Original Article

Abstract

Purpose

The purpose was to investigate the changes of the psoas major muscles (PM) cross-sectional area (CSA) and fat infiltration in the PM and to investigate the association between the morphology of the PM and expression of the degenerative changes of lumbar spine in patients with low back pain (LBP).

Methods

T2-weighted scans for measurements of the CSA and analysis of fat infiltration were performed on 42 patients and 49 controls using a 1.5 Tesla MR system. For a quantitative analysis of fat tissue infiltration a 4-grade visual scale was used.

Results

Patients had bigger CSA of the PM than controls at the levels of L3/L4 and L4/L5 intervertebral disc (P < 0.05). Patients with apparent degenerative changes of the lumbar spine had smaller CSA of the PM compared to the patients without apparent changes at the levels of L3/L4 and L4/L5 (P < 0.05). At the levels of L4/L5 and L5/S1 patients with present Modic changes in the lumbar vertebral bodies showed smaller CSA of the PM compared to the patients without Modic changes (P < 0.05). However, CSA of the PM in the patients with degenerative changes of lumbar spine and Modic changes was still bigger than the one of the controls. At all analyzed levels correlation between CSAs of the PM and fat infiltration of the lumbar paraspinal muscles was negative.

Conclusion

Results suggest increased activity of the PM in LBP patients but PM also remains active regardless of the presence of degenerative and Modic changes of the lumbar spine.

Keywords

Psoas major muscle Low back pain MRI Disc degeneration Modic changes 

Notes

Conflict of interest

None.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Juraj Arbanas
    • 1
    Email author
  • Ivan Pavlovic
    • 2
  • Verner Marijancic
    • 1
  • Hrvoje Vlahovic
    • 1
  • Gordana Starcevic-Klasan
    • 1
  • Stanislav Peharec
    • 3
  • Snjezana Bajek
    • 1
  • Damir Miletic
    • 2
  • Daniela Malnar
    • 1
  1. 1.Department of AnatomySchool of MedicineRijekaCroatia
  2. 2.Department of RadiologyClinical Hospital CentreRijekaCroatia
  3. 3.Polyclinic of Physical Medicine and Rehabilitation PeharecPulaCroatia

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