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Motor development in infancy and spine shape in early old age: findings from a British birth cohort study.

Saunders, Fiona R.; Gregory, Jennifer S.; Pavlova, Anastasia V.; Muthuri, Stella G.; Hardy, Rebecca J.; Martin, Kathryn R.; Barr, Rebecca J.; Adams, Judith E.; Kuh, Diana; Aspden, Richard M.; Cooper, Rachel; Ireland, Alex

Authors

Fiona R. Saunders

Jennifer S. Gregory

Stella G. Muthuri

Rebecca J. Hardy

Kathryn R. Martin

Rebecca J. Barr

Judith E. Adams

Diana Kuh

Richard M. Aspden

Rachel Cooper

Alex Ireland



Abstract

Spine shape changes dramatically in early life, influenced by attainment of developmental milestones such as independent walking. Whether these associations persist across life is unknown. Therefore, we investigated associations between developmental milestones and spine shape, as determined using statistical shape models (SSMs) of lumbar spine from dual-energy X-ray absorptiometry scans in 1327 individuals (688 female) at 60 to 64 years in the MRC National Survey of Health and Development. Lumbar lordosis angle (L4 inferior endplate to T12 superior endplate) was measured using the two-line Cobb method. In analyses adjusted for sex, height, lean and fat mass, socioeconomic position, and birthweight, later walking age was associated with greater lordosis described by SSM1 (regression coefficient, 0.023; 95% CI, 0.000-0.047; P=.05) and direct angle measurement. Modest associations between walking age and less variation in anterior-posterior vertebral size caudally (SSM6) were also observed (0.021; 95% CI, −0.002 to 0.044; P=.07). Sex interactions showed that later walking was associated with larger relative vertebral anteriorā€posterior dimensions in men (SSM3; −0.043; 95% CI, −0.075 to 0.01; P = .01) but not women (0.018; 95% CI, −0.0007 to 0.043; P = .17). Similar associations were observed between age at independent standing and SSMs but there was little evidence of association between sitting age and spine shape. Unadjusted associations between walking age and SSMs 1 and 6 remained similar after adjustment for potential confounders and mediators. This suggests that these associations may be explained by altered mechanical loading of the spine during childhood growth, although other factors could contribute. Early life motor development, particularly walking, may have a lasting effect on the features of spine morphology with clinical significance.

Citation

SAUNDERS, F.R., GREGORY, J.S., PAVLOVA, A.V., MUTHURI, S.G., HARDY, R.J., MARTIN, K.R., BARR, R.J., ADAMS, J.E., KUH, D., ASPDEN, R.M., COOPER, R. and IRELAND, A. 2020. Motor development in infancy and spine shape in early old age: findings from a British birth cohort study. Journal of orthopaedic research [online], 38(12), pages 2740-2748. Available from: https://doi.org/10.1002/jor.24656

Journal Article Type Article
Acceptance Date Mar 6, 2020
Online Publication Date Mar 18, 2020
Publication Date Dec 31, 2020
Deposit Date Apr 3, 2020
Publicly Available Date Apr 3, 2020
Journal Journal of orthopaedic research
Print ISSN 0736-0266
Electronic ISSN 1554-527X
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 38
Issue 12
Pages 2740-2748
DOI https://doi.org/10.1002/jor.24656
Keywords Growth; Loading; Mechano-adaptation
Public URL https://rgu-repository.worktribe.com/output/887924