Evaluation varus stress in total knee arthroplasty designed for deep knee flexion using knee kinematic motion simulator

Joko Triwardono, Harry Purnama, Wahyu Sulistyo, Fendy Rokhmanto, Rahadian Roberto, Ika Kartika, Sugeng Supriadi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Revision total knee arthroplasties cause performed aseptic loosening, instability, and polyethylene wear. The collaboration between surgeons and engineers for resulted in many developments in prosthesis design is needed. Separation or removal of the femoral component has been observed and this has the potential to severely damage the polyethylene component. In most cases 90% of the patients examined experienced significant medial or lateral condylar lift at some stage during the gait cycle. Using the MRI, a normal knee has maximum lateral lift is approx. 6.7 mm and maximum medial lift is approx. 2.1 mm, when a varus strees was applied at a 90° knee flexion. Elevation of the medial condyle due to varus malalignment will distribute more contact force on the lateral condyle. In this study, a polyethylene component of a posterior-stabilized right knee joint implant was developed to facilitate a high range of motion (ROM). Malalignment varus was observed with the axes of knee motion joint implants were varied from 0, 2, 3 to 5° and knee bend measurements at 30, 60, 90, 120, and 150° of knee flexion. Using the knee kinematic motion simulator, the modified polyethylene component resulted in 0° malalignment there is no gap of the femoral component with the polyethylene component, from 30 to 150° of knee flexion. At 2° malalignment, the femoral component was raised by 0.5 mm at a 120 to 150° knee flexion and increased with increasing knee flexion. Maximum gap occurs at 5° malalignment in the amount of 2 mm at 150° of knee flexion. The aim of this study was therefore to evaluation malalignment varus of the flexed knee using knee kinematic motion simulator, with reference to the tibiofemoral flexion gap. The result that the modified design is expected in a narrow down gap between femoral and polyethylene component to accommodate deep knee flexion movement in daily activities and reduce the possibility of subluxation and dislocation at the polyethylene component during deep knee flexion. Widest gap between femoral component and the polyethylene component more contact force on the lateral condyle increases potential wear or fracture the polyethylene.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
EditorsSigit Dwi Yudanto, Ari Yustisia Akbar, Fendy Rokhmanto, Made Subekti Dwijaya, Muhammad Yunan Hasbi, Wahyu Mayangsari, Yudi Nugraha Thaha
PublisherAmerican Institute of Physics
ISBN (Electronic)9780735448124
Publication statusPublished - 28 Feb 2024
Event5th International Seminar on Metallurgy and Materials, ISMM 2022 - Tangerang Selatan, Indonesia
Duration: 22 Nov 202223 Nov 2022

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


Conference5th International Seminar on Metallurgy and Materials, ISMM 2022
CityTangerang Selatan


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