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A statistical analysis of human talar shape and bone density distribution.

Jordan Stolle1, Christine M Harper2, Kristyn K Voegele3

  • 1Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, Pennsylvania, USA.

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|March 14, 2024
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Area of Science:

  • Orthopedics
  • Biomechanics
  • Medical Imaging

Background:

  • Talar shape and mechanical properties influence behavior under load.
  • Existing studies lack quantitative analysis of internal talar density distribution.
  • Talar implant design requires detailed understanding of bone structure.

Purpose of the Study:

  • To quantitatively analyze statistical variations in talar shape and internal density.
  • To provide data beneficial for the design of talar implants.
  • To investigate the impact of material heterogeneity on talar biomechanics.

Main Methods:

  • Acquired weight-bearing computed tomography (CT) scans in a neutral standing posture.
  • Generated 3D talar models and extracted local density from Hounsfield units.
  • Applied weighted spherical harmonic analysis for external shape and placed volumes of interest for density quantification.
  • Performed finite element analysis (FEA) comparing homogeneous and heterogeneous material properties.

Main Results:

  • Significant variations in talar density were observed based on sex and age.
  • Finite element analysis revealed differences in stress and strain response between homogeneous and heterogeneous models.
  • Talar heterogeneity significantly impacts load response.

Conclusions:

  • Quantitative analysis of talar shape and density is essential for orthopedic applications.
  • Internal bone density variations must be considered in talar implant design.
  • Accounting for material heterogeneity improves the accuracy of biomechanical load response analysis in tarsal bones.