Design and finite element analysis of total knee replacement (TKR) for additive manufacturing

• Published in: AIP Conference Proceedings
• Main Author: Arrif I.M.; Shuib S.; Anuar M.A.M.; Shokri A.A.; Pal B.; Aziz I.
• Format: Conference paper
• Language: English
• Published: American Institute of Physics Inc. 2023
• Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85166758325&doi=10.1063%2f5.0115924&partnerID=40&md5=0f448277b38440dc55956a1d9acde540

The patient from the Asian region always demanded a fully functional knee implant, which implied a high flexion range of motion. Most of their daily life activities used deep knee flexion which flexed until 165° such as the Japanese proper sitting style and Muslim prayer position. The problem of the study is extending the range of motion or achieving the high flexion of total knee replacement as the traditional total knee replacement was incapable to achieve more than 115°. Hence, the purpose of this study is to achieve a modified design of a knee implant that can flex up to 165° by carried out a static structural analysis in the ANSYS 2020 R1 software before fabricating the prototype. There are 0°, 90°, 135°, and 165° angles of flexion with a different net force based on the percentage of body weight implemented on the knee implant. The analysis includes total deformation, Von Mises stress, shear stress, and contact pressure on knee implant to be observed and compared with the existing NexGen LPS Flex knee to achieve a greater modification design. Subsequently, the result showed at high flexion angle of 165°, the selected modified tibial insert was reduced from the existing NexGen LPS Flex knee by 89.13% in total deformation, 87.53% in Von Mises stress, 84.30% in shear stress, and 90.28% in contact pressure. Therefore, this study illustrates that high flexion angle of total knee replacement is achievable with improving design modifications. © 2023 Author(s).