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Cyclic Mechanism Affects Lumbar Spine Creep Response.

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Title: Cyclic Mechanism Affects Lumbar Spine Creep Response.
Authors: Dimbath, Elizabeth D.1 (AUTHOR) elizabeth.dimbath@duke.edu, Morino, Concetta1,2 (AUTHOR), Middleton, Shea1 (AUTHOR), Kait, Jason1 (AUTHOR), Ortiz-Paparoni, Maria1 (AUTHOR), Slotkin, Theodore A.3 (AUTHOR), Luck, Jason F.1 (AUTHOR), Bass, Cameron R.'Dale'1,2,4 (AUTHOR)
Source: Annals of Biomedical Engineering. Apr2026, Vol. 54 Issue 4, p1086-1098. 13p.
Subjects: Cyclic loads, Vertebral fractures, Viscoelasticity, Biomechanics, Lumbar vertebrae, Spinal injuries
Abstract: Purpose: This study aims to explore how cyclic loading influences creep response in the lumbar spine under combined flexion-compression loading. Methods: Ten porcine functional spinal units (FSUs) were mechanically tested in cyclic or static combined flexion-compression loading. Creep response between loading regimes was compared using strain-time histories and linear regression. High-resolution computed tomography (µCT) visualized damage to FSUs. Statistical methods, ANCOVA and ANOVA, assessed differences in behavior between loading regimes. Results: Cyclic and static loading regimes exhibited distinct creep response patterns and biphasic response. ANCOVA and ANOVA analyses revealed significant differences in slopes of creep behavior in both linear phases. Cyclic tests consistently showed endplate fractures in µCT imaging. Conclusion: The study reveals statistically significant differences in creep response between cyclic and static loading regimes in porcine lumbar spinal units under combined flexion-compression loading. The observed biphasic behavior suggests distinct phases of tissue response, indicating potential shifts in load transfer mechanisms. Endplate fractures in cyclic tests suggest increased injury risk compared to static loading. These findings underscore the importance of considering loading conditions in computational models and designing preventive measures for occupations involving repetitive spinal loading. [ABSTRACT FROM AUTHOR]
Copyright of Annals of Biomedical Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Cyclic Mechanism Affects Lumbar Spine Creep Response.
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  Data: <searchLink fieldCode="JN" term="%22Annals+of+Biomedical+Engineering%22">Annals of Biomedical Engineering</searchLink>. Apr2026, Vol. 54 Issue 4, p1086-1098. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Cyclic+loads%22">Cyclic loads</searchLink><br /><searchLink fieldCode="DE" term="%22Vertebral+fractures%22">Vertebral fractures</searchLink><br /><searchLink fieldCode="DE" term="%22Viscoelasticity%22">Viscoelasticity</searchLink><br /><searchLink fieldCode="DE" term="%22Biomechanics%22">Biomechanics</searchLink><br /><searchLink fieldCode="DE" term="%22Lumbar+vertebrae%22">Lumbar vertebrae</searchLink><br /><searchLink fieldCode="DE" term="%22Spinal+injuries%22">Spinal injuries</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Purpose: This study aims to explore how cyclic loading influences creep response in the lumbar spine under combined flexion-compression loading. Methods: Ten porcine functional spinal units (FSUs) were mechanically tested in cyclic or static combined flexion-compression loading. Creep response between loading regimes was compared using strain-time histories and linear regression. High-resolution computed tomography (µCT) visualized damage to FSUs. Statistical methods, ANCOVA and ANOVA, assessed differences in behavior between loading regimes. Results: Cyclic and static loading regimes exhibited distinct creep response patterns and biphasic response. ANCOVA and ANOVA analyses revealed significant differences in slopes of creep behavior in both linear phases. Cyclic tests consistently showed endplate fractures in µCT imaging. Conclusion: The study reveals statistically significant differences in creep response between cyclic and static loading regimes in porcine lumbar spinal units under combined flexion-compression loading. The observed biphasic behavior suggests distinct phases of tissue response, indicating potential shifts in load transfer mechanisms. Endplate fractures in cyclic tests suggest increased injury risk compared to static loading. These findings underscore the importance of considering loading conditions in computational models and designing preventive measures for occupations involving repetitive spinal loading. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Annals of Biomedical Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s10439-024-03595-w
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      – SubjectFull: Cyclic loads
        Type: general
      – SubjectFull: Vertebral fractures
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      – SubjectFull: Viscoelasticity
        Type: general
      – SubjectFull: Biomechanics
        Type: general
      – SubjectFull: Lumbar vertebrae
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      – SubjectFull: Spinal injuries
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      – TitleFull: Cyclic Mechanism Affects Lumbar Spine Creep Response.
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              M: 04
              Text: Apr2026
              Type: published
              Y: 2026
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