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Related Concept Videos

Anatomical Positions01:11

Anatomical Positions

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In anatomy, several standard anatomical positions are used as references for describing the position and orientation of different body parts. These positions help provide a common frame of reference when discussing anatomical structures. The anatomical position is the standard reference point for describing the body's position and orientation. In this position:
The body is upright, facing forward, and standing erect.
The feet are parallel and flat on the floor.
The arms are hanging by the...
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Vertebral Column: Regions and Curvature01:16

Vertebral Column: Regions and Curvature

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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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In an adult, the spine is subdivided into five regions: the cervical, the thoracic, the lumbar, the sacral, and the coccygeal region. The spine initially develops as a series of 33 vertebrae; after 20 years of age, the nine bones in the sacral region, five sacral, and four coccygeal bones fuse to form...
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Related Experiment Video

Updated: Oct 12, 2025

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device
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Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device

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Variation in Sagittal Alignment Parameters in Adult Patients before Spine Surgery: A Serial Imaging Study Using

Hunjong Lim1, Eugene Lee1, Joon-Woo Lee1

  • 1Department of Radiology, Seoul National University Bundang Hospital, 82 Gumi-ro173 Beon-gil, Bundanggu, Seongnam-si 13620, Korea.

Diagnostics (Basel, Switzerland)
|November 27, 2021
PubMed
Summary

Preoperative spinal alignment can vary, especially the sagittal vertical axis (SVA). This variation increases with longer intervals between EOS imaging and patient age over 65, impacting surgical planning.

Keywords:
EOSlow back painradiographic parameterssagittal spinal alignmentserial imaging

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Area of Science:

  • Spine Surgery
  • Radiology
  • Orthopedics

Background:

  • Sagittal spinal alignment is crucial for evaluating and treating spinal diseases.
  • Limited research exists on preoperative sagittal spinal alignment variations.

Purpose of the Study:

  • To assess variations in sagittal spinal alignment using serial EOS imaging in adult patients prior to spine surgery.
  • To identify factors influencing these variations.

Main Methods:

  • Collected sagittal parameters from two serial EOS images of 66 adult patients.
  • Utilized the Wilcoxon signed-rank test for parameter comparison.
  • Conducted subgroup analyses based on imaging interval, patient age, and surgery type.

Main Results:

  • The sagittal vertical axis (SVA) showed statistically significant changes between serial images (p=0.023), with mean SVA increasing from 61.7 mm to 73.6 mm.
  • SVA differences were significant in patients with imaging intervals greater than 3 months (p=0.034) and borderline significant in those over 65 years (p=0.049).
  • No other parameters demonstrated statistically significant differences, highlighting SVA as the primary variable.

Conclusions:

  • Preoperative sagittal spinal alignment, particularly SVA, exhibits significant variability.
  • Increased time intervals between imaging and older patient age are associated with greater SVA changes.
  • These findings underscore the importance of considering dynamic sagittal alignment in surgical planning.