Inter-rater reliability of trunk muscle morphometric analysis

Stephanie Valentin*, Tobey De Mott Yeates, Theresia Licka, James Elliott

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


BACKGROUND: Inter-rater reliability of generalised lumbar extensor muscle CSA has been identified, however, more detailed reliability metrics of individual trunk muscles are lacking. OBJECTIVE: To report muscle volume and muscle fatty infiltrate (MFI) inter-rater reliability of individual trunk muscles between two novice assessors. METHODS: Lumbar axial MRI scans from 10 healthy male participants were analysed. The muscles erector spinae (ES), multifidus (M), rectus abdominis (RA), and psoas (PS) were manually traced, region of interest quantified and muscle volume and MFI determined by both assessors. Agreement between the assessors was determined using intraclass correlation coefficients (3,1), Bland-Altman plots and Lin's concordance coefficient. RESULTS: Good to excellent agreement was found for volume (ICC 0.77-0.96) and MFI (0.84-0.96) for all muscles on first evaluation, except for M volume, which required a second evaluation. Best agreement for muscle volume and MFI was found for ES (ICC 0.96). CONCLUSIONS: First evaluation of muscle volume and MFI yields high to excellent inter-rater agreement, except for M, where further training and/or experience is required to achieve acceptable reliability outcomes. This may have clinical implications due to the relevance of M atrophy reported in patients with low back pain.

Original languageEnglish (US)
Pages (from-to)181-190
Number of pages10
JournalJournal of Back and Musculoskeletal Rehabilitation
Issue number1
StatePublished - 2015


  • Inter-rater reliability
  • MRI
  • agreement
  • lumbar spine
  • muscle

ASJC Scopus subject areas

  • Rehabilitation
  • Physical Therapy, Sports Therapy and Rehabilitation
  • Orthopedics and Sports Medicine


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