Ankle arthroplasty and total ankle arthroplasty are two important treatments for end-stage degenerative ball. Its results on the biomechanics of the medial foot are not sufficient to determine which is better. This study compared the biomechanical parameters of feet treated with ankle arthrodesis, feet treated with total ankle arthroplasty, and healthy feet using statistical analysis. A validated tripod finite element model was designed to simulate the stance phase of gait. The results showed that total ankle arthroplasty provides more stable plantar pressure distribution than ankle arthrodesis. Among all replacements, the mean scaphoid joint had the highest contact pressure of 3.17 MPa. Surgery does not result in deep subscalar fusion. In both surgical models, an increase was achieved in the maximum metatarsals, especially in the second and third metatarsals. This study allows us to look at the internal biomechanics of foot defects and feet treated with total ankle arthroplasty and ankle arthrodesis during walking.