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Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

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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A structured framework for standardized 3D leg alignment analysis: An international Delphi consensus study.

Quinten W T Veerman1,2, Gabriëlle J M Tuijthof2, Nico Verdonschot2,3

  • 1OCON Centre for Orthopaedic Surgery and Sports Medicine, Hengelo, the Netherlands.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|April 16, 2025
PubMed
Summary
This summary is machine-generated.

International experts established a standardized 3D leg alignment analysis framework using 3D bone models. This consensus improves consistency and clinical application for knee osteotomies.

Keywords:
alignment parametersconsensuscoordinate systemsjoint orientationknee

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Area of Science:

  • Orthopedics
  • Biomechanical Engineering
  • Medical Imaging

Background:

  • Standardized three-dimensional (3D) leg alignment analysis is crucial for accurate preoperative planning and surgical execution, particularly for osteotomies around the knee.
  • Current methods exhibit variability, hindering consistent clinical application and cross-study comparability.
  • A structured framework is needed to address the complexity of anatomical structures in 3D leg alignment.

Purpose of the Study:

  • To achieve international expert consensus on a structured framework for standardized 3D leg alignment analysis using 3D bone models.
  • To enhance the consistency and clinical applicability of 3D leg alignment assessments.
  • To reduce methodological variability in the literature and improve inter-study comparisons.

Main Methods:

  • A four-round Delphi study involving a steering group and 35 international experts (clinicians and engineers).
  • Systematic review to identify principles for preserving 3D anatomical complexity.
  • Statements developed on deriving joint centers, orientations, and coordinate systems from 3D bone models, with consensus defined as ≥80% agreement.

Main Results:

  • Thirty-one statements were developed, with 26 achieving consensus in Round 3 and the remaining five in Round 4.
  • Agreement was reached on using all relevant surface data for defining joint centers, orientations, and coordinate systems (femoral, tibial, and leg).
  • Consensus was achieved on adopting central 3D axes for femoral version and tibial torsion.

Conclusions:

  • A consensus-based structured framework for standardized 3D leg alignment analysis using 3D bone models has been established.
  • This framework is expected to improve preoperative planning and surgical execution of knee osteotomies.
  • The study aims to reduce methodological variability and enhance comparability in 3D leg alignment research.