David Koch , Corina Nüesch , Dominika Ignasiak , Stefan Schären , Stephen J. Ferguson , Annegret Mündermann , Cordula Netzer
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This study investigates these factors using motion capture analysis.</div></div><div><h3>Methods</h3><div>In 11 patients with lumbar spinal stenosis (5 M/6 W; age, 71 ± 9 years; body mass index, 29 ± 5 kg/m<sup>2</sup>), 10 older controls (5 M/5F; 65 ± 5 years; 25 ± 6 kg/m<sup>2</sup>), and 10 young controls (5 M/5F; 26 ± 2 years; 22 ± 2 kg/m<sup>2</sup>), spinal alignment was assessed during standing and walking before and after a modified Biering-Sørensen test using reflective markers. The curvature of the thoracic and lumbar spine was modelled using a cubic polynomial. Spine inclination, thoracic kyphosis, lumbar lordosis and pelvic tilt were used to describe spinal alignment. The effects of group, activity and paraspinal muscle fatigue were investigated using bootstrapped mixed-effect models.</div></div><div><h3>Findings</h3><div>Patients and older controls had greater spine inclination than young controls. Spinal alignment did not differ between patients and older controls. Dynamic activity increased spine inclination, thoracic kyphosis, and pelvic tilt across all groups. Compared to non-fatigued conditions, significant spine inclination increases and lumbar lordosis decreases occurred with fatigue. A significant interaction effect for group and activity was found between patients and young controls.</div></div><div><h3>Interpretation</h3><div>Our findings suggest that age and activity, rather than lumbar spinal stenosis and muscle fatigue, play a critical role in spinal alignment. Further studies are warranted to investigate the underlying mechanisms. <span><span>ClinicalTrials.gov</span><svg><path></path></svg></span> ID <span><span>NCT05309447</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":50992,"journal":{"name":"Clinical Biomechanics","volume":"127 ","pages":"Article 106577"},"PeriodicalIF":1.4000,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Age and activity but not lumbar spinal stenosis and muscle fatigue affect sagittal spinal alignment: A pilot study\",\"authors\":\"David Koch , Corina Nüesch , Dominika Ignasiak , Stefan Schären , Stephen J. Ferguson , Annegret Mündermann , Cordula Netzer\",\"doi\":\"10.1016/j.clinbiomech.2025.106577\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Background</h3><div>Ageing is associated with changes in spinal alignment. Lumbar spinal stenosis may alter spinal alignment due to pain, muscle atrophy and fatigue. While spinal alignment and motion are crucial in lumbar spinal stenosis, the effects of age, activity, and muscle fatigue on spinal alignment remain unclear. This study investigates these factors using motion capture analysis.</div></div><div><h3>Methods</h3><div>In 11 patients with lumbar spinal stenosis (5 M/6 W; age, 71 ± 9 years; body mass index, 29 ± 5 kg/m<sup>2</sup>), 10 older controls (5 M/5F; 65 ± 5 years; 25 ± 6 kg/m<sup>2</sup>), and 10 young controls (5 M/5F; 26 ± 2 years; 22 ± 2 kg/m<sup>2</sup>), spinal alignment was assessed during standing and walking before and after a modified Biering-Sørensen test using reflective markers. The curvature of the thoracic and lumbar spine was modelled using a cubic polynomial. Spine inclination, thoracic kyphosis, lumbar lordosis and pelvic tilt were used to describe spinal alignment. 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Age and activity but not lumbar spinal stenosis and muscle fatigue affect sagittal spinal alignment: A pilot study
Background
Ageing is associated with changes in spinal alignment. Lumbar spinal stenosis may alter spinal alignment due to pain, muscle atrophy and fatigue. While spinal alignment and motion are crucial in lumbar spinal stenosis, the effects of age, activity, and muscle fatigue on spinal alignment remain unclear. This study investigates these factors using motion capture analysis.
Methods
In 11 patients with lumbar spinal stenosis (5 M/6 W; age, 71 ± 9 years; body mass index, 29 ± 5 kg/m2), 10 older controls (5 M/5F; 65 ± 5 years; 25 ± 6 kg/m2), and 10 young controls (5 M/5F; 26 ± 2 years; 22 ± 2 kg/m2), spinal alignment was assessed during standing and walking before and after a modified Biering-Sørensen test using reflective markers. The curvature of the thoracic and lumbar spine was modelled using a cubic polynomial. Spine inclination, thoracic kyphosis, lumbar lordosis and pelvic tilt were used to describe spinal alignment. The effects of group, activity and paraspinal muscle fatigue were investigated using bootstrapped mixed-effect models.
Findings
Patients and older controls had greater spine inclination than young controls. Spinal alignment did not differ between patients and older controls. Dynamic activity increased spine inclination, thoracic kyphosis, and pelvic tilt across all groups. Compared to non-fatigued conditions, significant spine inclination increases and lumbar lordosis decreases occurred with fatigue. A significant interaction effect for group and activity was found between patients and young controls.
Interpretation
Our findings suggest that age and activity, rather than lumbar spinal stenosis and muscle fatigue, play a critical role in spinal alignment. Further studies are warranted to investigate the underlying mechanisms. ClinicalTrials.gov ID NCT05309447.
期刊介绍:
Clinical Biomechanics is an international multidisciplinary journal of biomechanics with a focus on medical and clinical applications of new knowledge in the field.
The science of biomechanics helps explain the causes of cell, tissue, organ and body system disorders, and supports clinicians in the diagnosis, prognosis and evaluation of treatment methods and technologies. Clinical Biomechanics aims to strengthen the links between laboratory and clinic by publishing cutting-edge biomechanics research which helps to explain the causes of injury and disease, and which provides evidence contributing to improved clinical management.
A rigorous peer review system is employed and every attempt is made to process and publish top-quality papers promptly.
Clinical Biomechanics explores all facets of body system, organ, tissue and cell biomechanics, with an emphasis on medical and clinical applications of the basic science aspects. The role of basic science is therefore recognized in a medical or clinical context. The readership of the journal closely reflects its multi-disciplinary contents, being a balance of scientists, engineers and clinicians.
The contents are in the form of research papers, brief reports, review papers and correspondence, whilst special interest issues and supplements are published from time to time.
Disciplines covered include biomechanics and mechanobiology at all scales, bioengineering and use of tissue engineering and biomaterials for clinical applications, biophysics, as well as biomechanical aspects of medical robotics, ergonomics, physical and occupational therapeutics and rehabilitation.