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Unsymmetrical bending occurs when a structural member is subjected to bending moments in a plane that does not align with the member's principal axes. This scenario typically arises in beams and other structural components when loads are applied at non-ideal angles, introducing complexities in stress analysis.
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Vertebral Column: Regions and Curvature01:16

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The vertebral column or spine is a flexible column that supports the head, neck, and body and  allows for their movements. It also protects the spinal cord.
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Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
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Cervical coronal alignment matters.

Richard D Guyer1

  • 1Texas Back Institute, 6020 W. Parker Road #200, Plano, TX 75093, USA.

The Spine Journal : Official Journal of the North American Spine Society
|May 14, 2016
PubMed
Summary
This summary is machine-generated.

Proper coronal alignment of medical devices is crucial for preventing radiographic degeneration after total disc replacement surgery. This study highlights the importance of device positioning to maintain spinal health and long-term outcomes.

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Area of Science:

  • Spine surgery
  • Orthopedic biomechanics
  • Radiographic analysis

Background:

  • Total disc replacement (TDR) aims to preserve motion and reduce degeneration.
  • Coronal alignment of implanted devices is a critical surgical consideration.
  • Deviations in alignment may influence adjacent segment health.

Purpose of the Study:

  • To investigate the relationship between coronal alignment of the implanted device and radiographic degeneration.
  • To assess the impact of device positioning on the progression of spinal degeneration post-TDR.

Main Methods:

  • Retrospective analysis of patients who underwent total disc replacement.
  • Radiographic assessment of coronal alignment of the implanted device.
  • Evaluation of adjacent segment degeneration using plain radiographs.

Main Results:

  • Significant correlation observed between malalignment and increased radiographic degeneration.
  • Specific alignment parameters were identified as risk factors for degeneration.
  • Deviations in coronal alignment were associated with accelerated degenerative changes.

Conclusions:

  • Maintaining neutral or optimal coronal alignment of the device is essential for preventing adjacent segment degeneration.
  • Surgical technique and device placement should prioritize accurate coronal alignment.
  • Proper alignment may improve long-term outcomes and reduce the need for revision surgery.