Evaluation of the Transfemoral Bone-Implant Interface Properties Using Vibration Analysis

Area of Science:

• Biomechanics
• Biomedical Engineering
• Finite Element Analysis

Background:

• Assessing bone-implant interface (BII) properties in osseointegrated transfemoral (TFA) prostheses is crucial for detecting early failures and guiding rehabilitation.
• Dynamic modeling and BII property extraction are key for optimizing prosthetic limb performance and patient outcomes.

Purpose of the Study:

• To develop and validate a 1D finite element (FE) model of the Osseointegrated Prosthetic Limb (OPL) TFA system.
• The model aims to accurately simulate dynamic behavior and extract BII properties.

Main Methods:

• Validated a 1D FE model by comparing it to analytical and 3D FE solutions for simplified cylinders.
• Compared vibration modes of TFA geometry using 1D and 3D FE models.
• Evaluated BII properties under varying conditions using 3D FE and experimental data.

Main Results:

• The 1D FE model's predictions converged with analytical and 3D FE solutions for cylinder models.
• The 1D model closely matched 3D FE solutions for TFA geometry, with a maximum frequency difference of 2.02%.
• The model successfully extracted BII stiffness and damping properties for different interface conditions.

Conclusions:

• The 1D FE model effectively captures the dynamic behavior of the TFA system.
• The model demonstrates potential for non-invasive clinical evaluation of TFA bone-implant interface properties.