The lumbar spine has an intrinsic shape specific to each individual that remains a characteristic throughout flexion and extension

Anastasia V. Pavlova, Judith R. Meakin, Kay Cooper, Rebecca J. Barr, Richard M. Aspden (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Purpose: We have previously shown that the lumbar spine has an intrinsic shape specific to the individual and characteristic of sitting, standing and supine postures. The purpose of this study was to test the hypothesis that this intrinsic shape is detectable throughout a range of postures from extension to full flexion in healthy adults. Methods: Sagittal images of the lumbar spine were taken using a positional MRI with participants (n = 30) adopting six postures: seated extension, neutral standing, standing with 30, 45 and 60° and full flexion. Active shape modelling (ASM) was used to identify and quantify 'modes' of variation in the shape of the lumbar spine. Results: ASM showed that 89.5 % of the variation in the shape of the spine could be explained by the first two modes; describing the overall curvature and the distribution of curvature of the spine. Mode scores were significantly correlated between all six postures (modes 1-9, r = 0.4-0.97, P < 0.05), showing that an element of intrinsic shape was maintained when changing postures. The spine was most even in seated extension (P < 0.001) and most uneven between 35 and 45° flexion (P < 0.05). Conclusions: This study shows that an individual's intrinsic lumbar spine shape is quantifiable and detectable throughout lumbar flexion and extension. These findings will enable the role of lumbar curvature in injury and low back pain to be assessed in the clinic and in the working and recreational environments.

Original languageEnglish
Pages (from-to)S26-S32
Number of pages7
JournalEuropean Spine Journal
Volume23
Issue numberSUPPL. 1
DOIs
Publication statusPublished - 11 Jan 2014

Keywords

  • Intrinsic shape
  • Lumbar spine shape
  • MRI
  • Posture
  • Shape modelling

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