Tibio talar contact stress: An experimental and numerical study

Area of Science:

• Biomechanics
• Orthopedic Surgery
• Biomedical Engineering

Background:

• Tibio-talar contact stress is crucial for ankle joint function and integrity.
• Understanding stress shielding is vital for predicting bone response to mechanical loads.
• Accurate evaluation of contact stress requires validated computational and experimental methods.

Purpose of the Study:

• To compare finite element (FE) analysis with experimental testing for evaluating tibio-talar contact stress.
• To validate the use of high-resolution pressure sensors in ankle biomechanical studies.
• To investigate the influence of stress shielding on bone integrity and resistance.

Main Methods:

• A numerical finite element model of the ankle joint (tibia and foot) was created.
• Simulations involved constraining the foot and applying a 980 N load to the tibia.
• Experimental validation used a synthetic ankle model with a high-resolution Tekscan pressure sensor.

Main Results:

• FE analysis and experimental data showed good agreement regarding tibio-talar contact stress.
• A 15% difference was observed in the equivalent Von Mises contact stress between the two methods.
• The study successfully validated the computational approach against experimental findings.

Conclusions:

• The validated methods allow for objective statistical comparison of computational and experimental contact stress.
• Understanding stress shielding is important for assessing bone integrity and resistance.
• This approach facilitates further research into articular joint surface mechanics and bone health.