Contact Stresses in a Fixed-Bearing Total Ankle Replacement: A Finite Element Analysis

摘要

Category:Ankle, Ankle Arthritis, Basic Sciences/BiologicsIntroduction/Purpose:Third-generation ankle implants with good clinical results continued to increase the popularity of total ankle arthroplasty (TAA) to address end-stage ankle osteoarthritis preserving joint movement. Newer TAA used fixed-bearing designs, with a theoretical increase of contact stresses leading to a higher polyethylene wear. The purpose of this study was to investigate the contact stresses in the polyethylene component of a new third-generation TAA, with a fixed-bearing design, using 3D finite element analysis.Methods:A three-dimensional finite element model was developed based on the Zimmer Trabecular Metal Total Ankle (ZTMTA) and a finite element analysis was employed to evaluate the contact pressure, contact area and Von Mises stress in the polyethylene articular surface in the stance phase of the gait cycle.Results:The peak values were found at the anterior regions of the articulating surface, where reached 19.8 MPa at 40% of g...