Finite element analysis and CT-based structural rigidity analysis to assess failure load in bones with simulated...

Area of Science:

• Orthopedics
• Medical Imaging
• Biomechanical Engineering

Background:

• Cancer patients with bone metastases face high risks of pathological femur fractures.
• Current fracture risk assessment methods are inaccurate, leading to over-treatment or unexpected fractures.
• Accurate prediction of fracture risk is essential for effective patient management.

Purpose of the Study:

• To compare the accuracy of finite element (FE) models and computed tomography rigidity analysis (CTRA) in predicting femur fracture risk.
• To evaluate the clinical applicability of non-invasive techniques for assessing fracture risk in bone metastases.

Main Methods:

• Mechanical testing of ten pairs of human cadaveric femurs with simulated metastatic defects.
• Generation of FE models and CTRA to measure axial and bending rigidity.
• Statistical comparison of FE and CTRA predictions against experimental failure loads.

Main Results:

• Both FE models and CTRA demonstrated good correlation with experimental failure loads.
• Moderate to good correlations were observed between FE and CTRA rankings.
• No significant differences in prediction accuracy were found between the two non-invasive methods.

Conclusions:

• FE analysis and CTRA are promising non-invasive tools for assessing femur fracture risk in patients with bone metastases.
• Further validation in prospective clinical studies is recommended to confirm these findings.
• These techniques could potentially improve surgical decision-making and patient outcomes.