Journal of bodywork and movement therapies · 2026
Finite element analysis of cervicomedullary stress and strain in atlas orthogonal correction using radiographic rotational inputs: A multi-case study.
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Verderame Jonathan, Arslan Muhammad Shakib, Mukhtar Farhan, Abbas Zaheer
Аннотация
OBJECTIVES: The biomechanical effects of radiographically guided atlas-axis correction at the craniocervical junction remain insufficiently quantified, particularly at the tissue level. Therefore, this study aims to investigate the relationship between rotational alignment correction and cervicomedullary stress-strain response using a finite-element approach.
METHODS: A total of four retrospective clinical cases with pre- and post-correction radiographs were analyzed. Radiographic parameters, including axial spinous process rotation, atlas frontal plane, and cervical spine angle, were used as kinematic inputs in a validated three-dimensional finite-element model of the cervical spine (C0-C7). Simulations were performed under quasi-static conditions to evaluate spinal cord stress, strain, and ligament deformation.
RESULTS: Analysis showed that alignment correction resulted in consistent reductions in spinal cord stress (15-35%) and strain (18-40%) across all cases. Larger rotational corrections were associated with greater biomechanical improvements. In addition, ligament strain values remained within safe physiological limits (approximately 25-45% of failure thresholds), indicating no excessive loading of stabilizing structures.
CONCLUSIONS: This study demonstrates that radiographically guided alignment correction is associated with reduced cervicomedullary mechanical loading. The findings provide biomechanical insight into the relationship between rotational alignment and tissue-level response. However, the results should be interpreted as computational trends rather than clinical outcomes, and further studies with larger datasets and subject-specific models are required.
METHODS: A total of four retrospective clinical cases with pre- and post-correction radiographs were analyzed. Radiographic parameters, including axial spinous process rotation, atlas frontal plane, and cervical spine angle, were used as kinematic inputs in a validated three-dimensional finite-element model of the cervical spine (C0-C7). Simulations were performed under quasi-static conditions to evaluate spinal cord stress, strain, and ligament deformation.
RESULTS: Analysis showed that alignment correction resulted in consistent reductions in spinal cord stress (15-35%) and strain (18-40%) across all cases. Larger rotational corrections were associated with greater biomechanical improvements. In addition, ligament strain values remained within safe physiological limits (approximately 25-45% of failure thresholds), indicating no excessive loading of stabilizing structures.
CONCLUSIONS: This study demonstrates that radiographically guided alignment correction is associated with reduced cervicomedullary mechanical loading. The findings provide biomechanical insight into the relationship between rotational alignment and tissue-level response. However, the results should be interpreted as computational trends rather than clinical outcomes, and further studies with larger datasets and subject-specific models are required.