Influence of Polyethylene Insert Size on the Total Ankle Arthroplasty (TAA) Stability: A Dynamic FE Analysis

Abstract

Total ankle arthroplasty (TAA) is a common surgical intervention for end-stage ankle arthritis. This study investigates the impact of polyethylene insert size on TAA stability. Dynamic finite element modeling incorporating anatomically accurate talus and tibia components, along with varying insert sizes, was utilized. Kinematic data acquired through dynamic radiostereometric analysis have been used as input in the FE model. Results showed that a congruent ankle prosthetic implant (all components of size 2) involves in a greater stability but also in concentrate contact pressures. This aspects could lead to a better proprioception of the patient but also to a faster insert wear over time. This underscores the importance of personalized insert sizing in TAA surgery, guided by patient-specific factors. Advanced imaging and computational tools facilitate precise preoperative planning and intraoperative decision-making. Optimal insert selection is crucial for improving long-term TAA outcomes. Further research is needed to explore additional factors influencing prosthesis stability and refine surgical techniques for enhanced patient outcomes.