[Finite element analysis of artificial ankle elastic improved inserts].

Area of Science:

• Biomechanical Engineering
• Orthopedic Implant Design
• Finite Element Analysis

Context:

• Total ankle replacement (TAR) aims to restore function but faces challenges with prosthesis micromotion and joint surface wear.
• Existing INBONE II implant systems utilize standard inserts, prompting investigation into design modifications for improved biomechanical outcomes.
• Finite element analysis (FEA) is employed to simulate and evaluate the mechanical behavior of orthopedic implants under physiological loading conditions.

Purpose:

• To investigate the influence of novel artificial ankle elastic improved inserts on reducing prosthesis micromotion.
• To evaluate the impact of these improved inserts on improving joint surface contact mechanics.
• To compare the biomechanical performance of different improved insert designs against the original model using FEA.

Summary:

• Four types of improved inserts with varying flexible layer designs (arc/platform, 1.3/2.6 mm thickness) were modeled and analyzed.
• FEA simulations under ISO gait load revealed that improved inserts generally reduced bone-metal prosthesis interface micromotion compared to the original.
• While not statistically significant, improved inserts showed increased articular surface contact area and more uniform stress distribution, particularly with platform-type, thicker designs.

Impact:

• Incorporating flexible layers into artificial ankle inserts enhances elasticity, aiding impact force absorption and reducing interface micromotion.
• The study suggests that platform-type inserts with thicker flexible layers offer superior mechanical properties for total ankle replacement components.
• These findings provide valuable insights for optimizing artificial ankle insert design to improve long-term prosthesis performance and patient outcomes.