A three-dimensional ankle kinetostatic model to simulate loaded and unloaded joint motion

Area of Science:

• Biomechanics
• Orthopedics
• Computational Modeling

Background:

• The ankle joint's complex motion is challenging to model accurately.
• Existing kinematic models may not fully capture the joint's behavior under load.
• Understanding passive structures is crucial for accurate ankle biomechanical analysis.

Purpose of the Study:

• To develop a kinetostatic model of the tibiotalar (ankle) joint.
• To replicate both unloaded natural motion and behavior under external loads.
• To validate the model against anatomical evidence and clinical data.

Main Methods:

• Developed a kinetostatic model as a generalization of a prior kinematic model.
• Incorporated compliant links and additional elastic structures representing passive ankle structures.
• Identified model parameters using subject-specific and published data; simulated clinical tests.

Main Results:

• The kinetostatic model accurately replicates unloaded ankle motion.
• The model successfully simulates the ankle joint's behavior under external loads.
• Predicted ankle motion shows good agreement with literature data for clinical tests.

Conclusions:

• The developed kinetostatic model provides an accurate representation of ankle joint biomechanics.
• The model's structure is consistent with anatomical evidence.
• This model can be a valuable tool for analyzing ankle function and evaluating clinical tests.