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28.08.2018 | Original Article | Ausgabe 10/2018

European Spine Journal 10/2018

The effect of muscle ageing and sarcopenia on spinal segmental loads

Zeitschrift:
European Spine Journal > Ausgabe 10/2018
Autoren:
Dominika Ignasiak, Waldo Valenzuela, Mauricio Reyes, Stephen J. Ferguson
Wichtige Hinweise

Electronic supplementary material

The online version of this article (https://​doi.​org/​10.​1007/​s00586-018-5729-3) contains supplementary material, which is available to authorized users.

Abstract

Purpose

The interrelations between age-related muscle deterioration (sarcopenia) and vertebral fractures have been suggested based on clinical observations, but the biomechanical relationships have not been explored. The study aim was to investigate the effects of muscle ageing and sarcopenia on muscle recruitment patterns and spinal loads, using musculoskeletal multi-body modelling.

Methods

A generic AnyBody model of the thoracolumbar spine, including > 600 fascicles representing trunk musculature, was used. Several stages of normal ageing and sarcopenia were modelled by reduced strength of erector spinae and multifidus muscles (ageing from 3rd to 6th life decade: ≥ 60% of normal strength; sarcopenia: mild 60%, moderate 48%, severe 36%, very severe 24%), reflecting the reported decrease in cross-sectional area and increased fat infiltration. All other model parameters were kept unchanged. Full-range flexion was simulated using inverse dynamics with muscle optimization to predict spinal loads and muscle recruitment patterns.

Results

The muscle changes due to normal ageing (≥ 60% strength) had a minor effect on predicted loads and provoked only slightly elevated muscle activities. Severe (36%) and very severe (24%) stages of sarcopenia, however, were associated with substantial increases in compression (by up to 36% or 318N) at the levels of the upper thoracic spine (T1T2–T5T6) and shear loading (by up to 75% or 176N) along the whole spine (T1T2–L4L5). The muscle activities increased for almost all muscles, up to 100% of their available strength.

Conclusions

The study highlights the distinct and detrimental consequences of sarcopenia, in contrast to normal ageing, on spinal loading and required muscular effort.

Graphical abstract

These slides can be retrieved under Electronic Supplementary Material.

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Zusatzmaterial
Supplementary material 1 (PPTX 181 kb)
586_2018_5729_MOESM1_ESM.pptx
Supplementary material 2 (DOCX 697 kb)
586_2018_5729_MOESM2_ESM.docx
Literatur
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