Analysis On Biomechanical Model About Artificial Joint Prosthesis

Since Total Hip Arthroplasty (THA) appeared in this world, it has been greatlypromoted the development of hip joint surgery. As a result, a lot of patients whosuffered from the joint disease for years have a new life again. It is an effective waywhich is widely used as a treatment of hip joint disease in surgical orthopedic field.The survival time of hip prosthesis is the most important sign of a successful jointreplacement surgery. Under normal circumstances, Successful artificial jointreplacement surgery can make the survival time of hip prosthesis to10-30years. Animportant basis to measure whether the hip prosthesis can continue to survive or not isto see whether the artificial joint can make the entire joint force normal or the stresschanges can remain at a reasonably normal range. Total hip prosthesis is composed byacetabular prosthesis, artificial femoral head and joint handle.Our subject take the thefemoral head as the research object, and conduct a comprehensive analysis ofthe biomechanics of hip replacement system. The results of the study will help tounderstand the mechanical properties of artificial joint prosthesis system.And they arealso very helpful to the further research on survival period as well as theclinical choice of prosthesis.The main work of this paper is highly accurate three-dimensional reconstructionon the human femur.And next we establish the finite element model and do themechanical analysis. Before the three-dimensional reconstruction, we do the imageinterpolation first by using the improved interlaminar interpolation method. Whichgreatly improves the accuracy of three-dimensional reconstruction, and its visualeffects and image quality are also greatly improved. The paper’s main work includes:1. Considering the interpolation of cross-sectional medical images is one of thekey steps of3D medical image reconstruction and it directly affects the accuracy of theresults on the three-dimensional reconstruction of human tissues and organs. Toovercome the shortcomings such as blurred border of images and lower efficiency caused by present interpolation methods, an interslice interpolation based on therelativity for medical image is presented in this paper. This algorithm makes good useof voxel relativity and structure relativity and then the different methods are adopted tointerpolate the different points, In addition, error checkout is introduced to check themismatching points．The experimental validation and analysis show that the proposedalgorithm has less computational complexity and improves the quality of image, theresult can be used to3D reconstruction effectively.2. For studying the phenomenon of prosthesis loosening after the total hiparthroplasty, we establish a three-dimensional model of the femur through medicalimages in DICOM format. And we also establish a three-dimensional finite elementmodel of the human femur by meshing the model and adding material properties. Thismodel can help doctors to do the intuitive analysis and quantitative research of jointorganization after surgery. So as to provide great convenience to the next step ofresearch this are analysising the finite element model and determining the service lifeof the prosthesis.3. For the study of the service life of the prosthesis after total hip replacementprosthesis, we do the mechanical analysis to the finite element model. Simulate ahuman feet gait which is walking slowly.We applied an appropriate force on the top ofthe femoral head and the prosthesis from three directions. And get the stress contoursof the model. Compare the forces of the the femoral head and the prosthesis.Finally,we establish the mechanical model of the proximal femur.