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Related Concept Videos

Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

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When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
166
Three-Dimensional Analysis of Strain01:29

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Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
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Updated: Jun 28, 2025

Dissection, MicroCT Scanning and Morphometric Analyses of the Baculum
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Capturing the cervical spine shape: Angular measurements versus geometric morphometric methods.

Einat Kedar1,2, David Ezra3, Ruth Pelleg-Kallevag1,2,4

  • 1Department of Anatomy and Anthropology, Faculty of Medical & Health Sciences, Tel Aviv University, Tel Aviv, Israel.

Clinical Anatomy (New York, N.Y.)
|April 24, 2024
PubMed
Summary
This summary is machine-generated.

Cervical spine shape classification varies by measurement method, with lordosis being most common. Neck shape is age-dependent but not sex-dependent, and is influenced by sagittal balance.

Keywords:
anatomic variationcervical spine anglecervical spine shapecervical spine shape classificationspinal curvatures

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Area of Science:

  • Orthopedics
  • Radiology
  • Biomechanical analysis

Background:

  • Cervical spine shape exhibits significant variation.
  • Traditional methods for assessing cervical spine curvature lack validation against actual shape.
  • Discrepancies exist in classifying cervical spine shapes using conventional angular measurements.

Purpose of the Study:

  • To compare shape classifications of the cervical spine using traditional angular measurements against a 2D landmark-based geometric morphometric method.
  • To investigate associations between cervical spine shape and demographic factors, head position, and spinal sagittal balance.

Main Methods:

  • CT scans of 163 cervical spines were analyzed.
  • Cervical spine shape was assessed using C2-C7 Cobb angle (CA), posterior tangent angle (PTA), and 2D geometric morphometrics.
  • Head position (FMCA) and sagittal balance (T1SA) were measured.

Main Results:

  • Cervical lordosis was the predominant shape (46.6%-54.6%), followed by straight (28.2%-30.1%) and kyphotic (15.3%-25.2%) shapes.
  • Approximately one-third of individuals were classified into different shape groups using CA and PTA methods.
  • Cervical spine angle was age-dependent but sex-independent.
  • T1SA showed significant correlation with CA and PTA (r=0.640, r=0.585; p<0.001).

Conclusions:

  • Cervical spine shape evaluation is method-dependent.
  • Age significantly influences cervical spine shape.
  • Sagittal balance is associated with cervical spine curvature and head position.