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Skeletal Radiology

, Volume 47, Issue 7, pp 939–945 | Cite as

Is a single-level measurement of paraspinal muscle fat infiltration and cross-sectional area representative of the entire lumbar spine?

  • Julio UrrutiaEmail author
  • Pablo Besa
  • Daniel Lobos
  • Marcelo Andia
  • Cristobal Arrieta
  • Sergio Uribe
Scientific Article

Abstract

Purpose

Lumbar paraspinal muscle morphology has recently been evaluated in several studies with conflicting results. Several studies have performed single-slice evaluations of paraspinal muscle morphology, whereas other studies have done a multi-level assessment; this methodological difference might explain the observed different results. Our study evaluated if a single-slice axial measurement is representative of the entire lumbar musculature.

Methods

We included 80 adult patients who were consecutively evaluated with magnetic resonance imaging (MRI) for spinal symptoms. Using T2-weighted axial images, we measured the fat signal fractions (FSF) and cross-sectional area (CSA) of the erector spinae and multifidus at the five levels of the lumbar spine (from L1-L2 to L5-S1). We used the ANOVA test for repeated measurements (with Bonferroni correction) to compare the FSF and CSA among the levels.

Results

Erector spinae showed an increasing FSF from L1-L2 to L5-S1; all erector spinae FSF comparisons among the different levels were significantly different. Multifidus FSF also increased caudally below L2-L3, although significant differences were observed only with two or more levels of distance. The CSA of the erector spinae showed a caudal decrease (L4-L5 and L5-S1 being significantly smaller than all the levels above). The CSA of the multifidus showed that all levels exhibited a significantly different area compared to their adjacent level (except L5-S1 compared to L4-L5).

Conclusions

No single-level FSF or CSA is representative of the whole lumbar spine. A standardized multi-level evaluation of the paraspinal musculature should be used in future research.

Keywords

Paraspinal muscles Magnetic resonance imaging Aging spine Fatty infiltration, cross-sectional area 

Notes

Acknowledgements

CONICYT FONDEF/I Concurso IDeA en dos etapas ID15I10284.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflicts of interest.

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Copyright information

© ISS 2018

Authors and Affiliations

  • Julio Urrutia
    • 1
    Email author
  • Pablo Besa
    • 1
  • Daniel Lobos
    • 1
  • Marcelo Andia
    • 2
    • 3
  • Cristobal Arrieta
    • 3
  • Sergio Uribe
    • 2
    • 3
  1. 1.Department of Orthopaedic Surgery, School of MedicinePontificia Universidad Catolica de ChileSantiagoChile
  2. 2.Department of Radiology, School of MedicinePontificia Universidad Catolica de ChileSantiagoChile
  3. 3.Biomedical Imaging CenterPontificia Universidad Catolica de ChileSantiagoChile

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