Kinematic analysis of high flex knee implant in sagittal plane before manufacturing real prosthesis

A high flex knee implant has been designed using a current generation computer modeling software and it's kinematic analysis was studied in sagittal plane by creating a kinematic analysis model in motion analysis software. The model includes femoral component, tibia component and tibia insert. Effect of soft tissue was considered the same with it is reported in literature and Effect of friction is neglected. The mechanism was studied in two separate steps. Results show 155° of flexion with 10mm anterior displacement of tibia from full extension to full flexion. In each step, the kinematic solver displays the relative positions of prosthesis components and calculates the velocity of them. This investigation represents the first attempt of using motion analysis software which is capable to solve mechanisms only driven by forces, to predict the TKR motion without any programming. In order to validate the results a full flexion cycle was compare with the results which is reported in literature. Further study have to carry out to evaluate the ability of this kinematic analysis model for analyzing the kinematics of prosthesis with considering all 6DOF which happen in real cases.