Surface Modification and Software Design of Customized Knee Joint
Chin YU Wang, Chien Fen Huang, Yi-Lin Liou, Life Science Journal, December 2014, Volume 11, Number 12, Article 137.
Abstract
This paper used the medical image of a patient's knee joint as basis to assemble a complete human knee through geometric software. Because this model can’t precisely align the position, local contact will occur which would cause stress concentration. It should undergo the tension adjustment of the ligaments to adjust the relative positions of the cartilage of the femoral condyle, the meniscus and the femoral cartilage to the minimal relative position of the contact stress to comply with the lowest energy or stress allowed by the law of nature for our body needs. First, this study used the spring simulation in the ligament tension and used the software, RecurDyn, to find the relative position of the minimum contact stress of the knee system. Second, the customized man-made knee was imported in the biomechanical software called LifeMod to build muscles and the ligaments system to simulate the ligament tensions of the artificial knee under a variety of sports. Aside from being the basis for the spring coefficient setting of the human knee, the tension can also select the specific posture of the knee in the model and then convert it into a file of ANSYS stress analysis software to complete a more accurate stress analysis. Finally, we can retest the human and artificial knee joints under different postures in the above steps to know the changes in the patterns between contact stress and contact area to obtain customized artificial knee prosthesis closest to the patient’s original human knee joints. The concept is the same if the original denture tooth shape is kept, we can be able to organize the most stable and compatible peripherals, prolong the life of the prosthesis and reduce its possibility of loosening.
How Multibody Dynamics Simulation Technology is Used
RecurDyn is used to perform dynamic simulation of an artificial knee. The geometry of the artificial knee is imported into RecurDyn from a CAD program. Accurate data from physical testing can be limited and difficult to obtain. RecurDyn provides an easy way to test if design parameters are within an acceptable performance range.
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