Computer-Aided Design for Analyzing the Influence of Single Radius on Flexion Angle of Artificial Knee Joint

The range of flexion in the knee joint is one of the most important factors that enable the performance of daily activities. However, patients with artificial knee joints (AKJ) experience difficulties in carrying out activities that involve deep flexion angles. Sitting cross-legged, kneeling, and squatting are important parts of the daily routines of the Asian population, since they support religious, social, and cultural activities, and they all require a flexible range of $150^{\circ}-165^{\circ}$. The range of the flexion angle is increased, using the single radius (SR) system the development of AKJ. This study aims to analyze the effect of single radius design on AKJ, as it suits the needs of Asians in religion, society, and culture. Einscan Pro 2X Plus brand scanner, De Puy’s physical model, and the Autodesk Fusion 360 were utilized during modeling. Then, reconstruction was performed which includes, surface digitization, curve processing, and improvement of components. The computer-aided design (CAD) based AKJ which utilized the SR system had a significant effect on the design that suits the needs of Asians, especially Indonesians. This design is capable of producing flexible angles from 150.4° to 169.4°.