College of Engineering

Xin Yue Jocelyn Liu

College of Engineering

Mechanical Engineer

Faculty Mentor: Dr. Sorin Siegler

Mechanical Engineering &

Mechanics

Tobias Konow Co-Mentor

Comparison Study of the Tibial Trays of Total Ankle Replacements

Total Ankle Replacements (TARs) are frequently used to restore joint function and relieve pain induced by osteoarthritis or trauma. However, these devices still show unacceptably high failure rates. Common reasons are loosening or migration of the tibial tray. The goal of this study is to compare different tibial trays of TARs for primary stability and find the optimal design. Tibial trays were ranked, on a 100-points scale, with regards to implantation technique, satisfaction, follow-up results, fixation, bone ingrowth area, and kinematic behavior. The results show the Hintegra has the least tibial bone resection (6.98 cm3) while the Agility has the most (16.6 cm3). The Zimmer and Hintegra tied for the highest AOFAS Hindfoot Score (85 pts.) while the Agility has the lowest Hindfoot Score (76.4). The Salto has both the greatest area for bone ingrowth (27 cm2) and the highest survival rate (95.8% five year rate). The Agility has the lowest survival rate (86% six year rate). The Hintegra has the smallest area for bone ingrowth (12.7 cm2). The Salto was ranked highest score overall while the Agility was ranked lowest. Thus, the Salto provides the best tibial tray fixation.