Numerical simulation of strain-adaptive bone remodelling in the ankle joint

Area of Science:

• Biomechanical engineering
• Orthopedic research
• Computational modeling

Background:

• Ankle arthritis treatment traditionally involves arthrodesis, but endoprosthetic implantation is increasing.
• Finite element analysis (FEA) of bone remodelling is established for hip joints but not extensively studied for ankle joints.
• Understanding ankle joint biomechanics is crucial for optimizing new implant designs.

Purpose of the Study:

• To simulate strain-adaptive bone remodelling in the tibia and talus following ankle joint endoprosthesis implantation.
• To evaluate and optimize next-generation ankle joint implants through biomechanical analysis.
• To gain insights into the biomechanical behavior of the ankle joint post-implantation.

Main Methods:

• Developed finite element (FE) models of the tibia-implant and talus-implant assemblies.
• Incorporated bone density distributions from CT scans and applied a 5,200 N compression force.
• Utilized a previously established bone adaptation law to calculate remodelling processes.

Main Results:

• Calculated a 2% bone mass loss in the tibia and a 13% loss in the talus.
• Observed greater density decline in the talus due to its smaller size relative to implant dimensions.
• Bone remodelling in the tibia was localized near the implant, unlike the more widespread effect in the talus.

Conclusions:

• Strain-adaptive bone remodelling processes in the ankle joint were successfully simulated using FEA.
• The findings enhance understanding of ankle joint biomechanics and implant interactions.
• Results provide a basis for future optimization of ankle implant geometry and surgical procedures.