Evaluation Tibia Rotation in Total Knee Arthroplasty Designed for Deep Knee Flexion Using Knee Kinematics Motion Simulator

Total knee arthroplasty is a successful procedure for treating chronic degenerative knee pathologies, many patients are dissatisfied with the results of the standard design. Improper tibia rotation of the implant is suspected to contribute to post-operative pain, polyethylene wears, aseptic loosening, and instability. Many factors can influence the alteration of knee kinematics after surgery including differences in implant design. Using magnetic resonance imaging, tibia rotation in a normal knee has-15.0 degrees and-2.5 degrees in weight-bearing males neutral tibia rotation, and tibia rotation in postoperative patients has 2.1 degrees and 9.5 degrees using computer tomography. In this study, a knee joint implant was developed to facilitate a high range of motion. Tibia rotation was observed with the axes of knee motion joint implants varied from 0 degrees, 2 degrees, 3 degrees to 5 degrees and knee bend measurements at 30 degrees, 60 degrees, 90 degrees, 120 degrees, and 150 degrees of knee flexion using the knee kinematic motion simulator and the results will be compared with the results from magnetic resonance imaging and computer tomography. Using statistical analysis resulted for 0 degrees and 2 degrees kinematics alignment, the p-value of the development product is 0.072 and 0.054 (p > 0.05), for 3 degrees and 5 degrees kinematics alignment, the p-value of the development product is 0.039 and 0.031 (p < 0.05). Thus, the kinematics development product at 0 degrees and 2 degrees kinematics alignment are similar to a normal human knee joint. Evaluation of knee kinematics implant using a knee motion simulatoris expected to become astandard procedure before performing total knee arthroplasty surgery. This similarity in kinematics knee implant with a normal knee is to be expected to reduce postoperative pain, polyethylene wears, aseptic loosening, and instability during deep knee flexion and minimize the risk of implant failure.