Effect of a mattress on lumbar spine alignment in supine position in healthy subjects: an MRI study
- PMID: 37661237
- PMCID: PMC10475448
- DOI: 10.1186/s41747-023-00361-w
Effect of a mattress on lumbar spine alignment in supine position in healthy subjects: an MRI study
Abstract
Background: Humans should sleep for about a third of their lifetime and the choice of the mattress is very important from a quality-of-life perspective. Therefore, the primary aim of this study was to assess the changes of lumbar angles, evaluated in a supine position using magnetic resonance imaging (MRI), on a mattress versus a rigid surface.
Methods: Twenty healthy subjects (10 females, 10 males), aged 32.3 ± 6.5 (mean ± standard deviation), with body mass index 22.4 ± 2.9, completed three evaluations: (i) spine MRI in supine position on a mattress (MAT); (ii) spine MRI in supine position on rigid surface (CON); and (iii) biplanar radiographic imaging in standing position. The following indexes were calculated for both MAT and CON: lumbar lordosis angles L1-L5, L1-S1, L5-S1, and the sacral slope (SS). Further, pelvic incidence (PI) was calculated from the biplanar radiographic images.
Results: Main findings were (i) L1-L5 and SS were greater in MAT than CON (L1:L5: +2.9°; SS: +2.0°); (ii) L5-S1 was lower in MAT than CON (-1.6°); (iii) L1-S1 was greater in MAT than CON only for male subjects (+2.0°); (iv) significant and positive correlations between PI and L1-L5, L1-S1 and SS were observed in both CON and MAT.
Conclusions: The use of a mattress determined small but statistically significant changes in lumbar angles.
Relevance statement: The use of a mattress determines small but statistically significant changes in radiological angles describing the sagittal alignment of the lumbar spine when lying in the supine position.
Key points: • Lordosis angle L1-L5 was greater in MAT than in CON condition (+2.9°). • Sacral slope was greater in MAT than in CON condition (+2.0°). • Lordosis angle L5-S1 was lower in MAT than in CON condition (-1.6°).
Trial registration: ClinicalTrials.gov NCT04638374.
Keywords: Lordosis; Magnetic resonance imaging; Sacrum; Sleep; Spine.
© 2023. European Society of Radiology (ESR).
Conflict of interest statement
Two of the authors of this paper, JAV and SB, have disclosed potential conflicts of interest which include receipt of payment as scientific consultants by Dorelan B&T S.P.A. (Forlì, Italy). Nobody from that company participated in study design or in the collection, analysis, and interpretation of data. Data can be accessed directly only by authors.
LMS and FG are a member of the
The are no further conflicts of interest to report.
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