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Yeon Soo Lee,Joyce H. Keyak,Thay Q. Lee 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This study aimed to assess the stress change inside the patella after implantation of an polyethylene patella button. Finite elements models of the patellae before and after implantation of patellar button were created. Experimentally determined spring constants of muscles and ligaments, and patellofemoral contacting loads were applied to the models at 30°, 60°, and 90° of knee flexion. The Von Mises stress of the intact patella decreased with increased knee flexion, while that of implanted patella increased. Also, the stress scale in the implanted patella was 3~9 times higher than in the intact one. The highly stressed region of the intact patella moved proximally with higher knee flexion angles, while that of the implanted model stayed near the central anterior patella. At 90° of knee flexion, the stress in the anterodistal patella increased considerably after implantation of a patella button so that the anterodistal patella may be susceptible to be painful source.