Effects of asymmetric loading on lateral spinal curvature in young adults with scoliosis: A preliminary study

Research output: Contribution to journalArticle

Abstract

Background: Usual guidelines recommend symmetric load carriage over asymmetric load carriage. Whether this recommendation is valid for subjects with asymmetric body alignment, such as those with scoliosis, remains unclear. Scoliosis is both a subject-dependent and time-variant condition. Interventions are generally employed to prevent the abnormal spinal curvature from progressing.
Objectives: To investigate the effects of an asymmetric load carriage on lateral spinal deformity in participant with scoliosis.
Study design: Repeated measure and single-case experimental designs
Methods: Photogrammetry was employed to measure the scoliotic curvature changes in thoracic and lumbar regions without a load (0%) and with a single-strap cross-chest bag loaded at 2.5%, 5%, 7.5%, 10% and 12.5% of body weight. Statistical tests and programming models were adopted to determine the loading conditions (placement and weight of the bag) with optimal and minimal corrections of the affected and unaffected scoliotic spinal regions, respectively.
Results: Significant short-term postural correction of scoliosis was achieved through applying an asymmetric load on the ipsilateral shoulder relative to the apex location of the major scoliotic curve.
Conclusion: A subject-specific optimal loading configuration was determined using a programming model. The results suggest that the application of a properly controlled asymmetric load carriage might be possible for reducing scoliotic spinal curvature. Further study of the long-term effects of subject-specific optimal asymmetric load carriage on scoliotic spinal curvatures is warranted.
Clinical relevance: Short-term reduction of scoliotic spinal curvatures under asymmetric load carriage was demonstrated. Thoracic curvatures could be reduced when asymmetric loading was applied on the ipsilateral shoulder relative to the scoliotic apex. Multiobjective programming was applied to determine the optimal weight of asymmetric load for participant with scoliosis. Copyright © 2018 The International Society for Prosthetics and Orthotics.
Original languageEnglish
Pages (from-to)554-562
JournalProsthetics and Orthotics International
Volume42
Issue number5
Early online dateFeb 2018
DOIs
Publication statusPublished - Oct 2018

Citation

Li, S. S. W., & Chow, D. H. K. (2018). Effects of asymmetric loading on lateral spinal curvature in young adults with scoliosis: A preliminary study. Prosthetics and Orthotics International, 42(5), 554-562. doi: 10.1177/0309364618757784

Keywords

  • Scoliosis
  • Biomechanics
  • Asymmetric load carriage
  • Multiobjective programming

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