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Sacroiliac joint auricular surface morphology modulates its mechanical environment.

Petr Henyš1, Niels Hammer2,3,4

  • 1Institute of New Technologies and Applied Informatics, Faculty of Mechatronics, Informatics and Interdisciplinary Studies, Technical University of Liberec, Liberec, Czechia.

Journal of Anatomy
|November 18, 2024
PubMed
Summary

Sacroiliac joint (SIJ) morphology significantly impacts its biomechanics. Larger SIJs with greater cartilage volume reduce stress and deformation, potentially lowering dysfunction risk.

Keywords:
finite element simulationmachine learningsacroiliac joint anatomy

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Area of Science:

  • Biomechanics
  • Anatomy
  • Medical Imaging

Background:

  • The sacroiliac joint (SIJ) is crucial for transmitting mechanical energy between the upper and lower body.
  • Significant variations in SIJ auricular surface morphology exist.
  • The influence of SIJ morphology on its mechanical behavior is not well understood.

Purpose of the Study:

  • To investigate the relationship between SIJ auricular surface morphology and its biomechanical response.
  • To understand how variations in cartilage thickness, surface area, and volume affect stress and deformation.

Main Methods:

  • Computed tomography (CT) scans from 281 individuals were used to extract pelvic ring geometry.
  • Finite element models were created to simulate SIJ mechanical loading.
  • Measurements included auricular surface area, SIJ cartilage thickness, and SIJ cartilage volume.

Main Results:

  • SIJ cartilage thickness showed strong sex sensitivity but weak dependence on age or laterality.
  • Auricular surface area and cartilage volume varied non-linearly with age, peaking around menopause in females.
  • Larger SIJs with greater auricular area and cartilage volume demonstrated reduced stress and deformation under load.

Conclusions:

  • SIJ morphology plays a significant role in its biomechanical response.
  • Morphological variations may be linked to the risk of SIJ dysfunction.
  • Understanding these relationships can aid in diagnosing and treating SIJ-related conditions.