Curved Beam Computed Tomography based Structural Rigidity Analysis of Bones with Simulated Lytic Defect: A...

Area of Science:

• Biomechanics
• Medical Imaging
• Orthopedic Surgery

Background:

• Assessing bone strength is crucial for fracture prediction, especially in cases of lytic defects.
• Existing methods may not fully account for the complex geometry of long bones like the femur.

Purpose of the Study:

• To introduce and validate a novel CT-based structural rigidity analysis (CTRA) method for predicting the compressive failure load of human femurs.
• To incorporate bone's intrinsic local curvature into the analysis for improved accuracy.

Main Methods:

• Developed a 3D curved beam theory-based CTRA method to analyze critical stresses in human femur models.
• Acquired quantitative computed tomography (CT) images of ten human cadaveric femurs with and without simulated defects.
• Performed mechanical testing under axial compression to failure, alongside CTRA and finite element analysis (FEA).

Main Results:

• Failure loads predicted by the curved beam CTRA and FEA closely matched experimental results.
• The proposed CTRA method efficiently and reliably identified the location and magnitude of failure loads.
• Curved CTRA demonstrated superior performance compared to straight beam CTRA, which neglects bone curvature.

Conclusions:

• The CT-based structural rigidity analysis (CTRA) method, incorporating local curvature, is an efficient and reliable tool for assessing human femur compressive failure load.
• This advanced CTRA method outperforms traditional straight beam analysis and shows significant potential for clinical applications in orthopedic surgery.