The Basic Theory Research In The Personalized Anatomic Plate Of Distal Femoral Using Computer-aided Design And Manufacture

Objective:1. A three-dimensional solid model of distal femoral fracture was established, applying CT scanning date, then to perform simulated reduction. 2. A three-dimensional solid model of distal femoral personalized anatomic plate was established, applying distal femoral fracture three-dimensional solid model.Methods:One case of male patient with distal femoral fracture was used in the experiment, and the raw data of selected regions was obtained through the thin slices CT scan. The data was saved in Dicom format and exported into the Mimics software, then a solid model of distal femoral fractures was obtained. The model was saved in IGES format, and imported into Geomagic software, transformed IGES point cloud data into polygon model and mesh model of the structure, finally the closed NURBS surface model was obtained. The femur surface model was filed into UG software in IGES format, selected the best fitting surface fitting with the plate according to surgical experience and demand on the femur surface plate. The outer surface of the femur was cut down in accordance with design requirements, and then used the function of surface modeling in UG software to design the upper plate surface and side to form a plate cavity model, personalized plate data was designed after materialized cavity model. Saved the plate data in a STL format file and imported into Mimics software. Refer the situation in which bone plate screws to determine the optimal drilling location and the direction of screws of the punch. To determine the location of the screw holes in the UG software through comparison, according to the measurement results in Mimics software, the size of screw selected in accordance with the surgery were virtual assembly in the UG software. The screw were saved in STL format and imported into Mimics software, in which the reduction of femur was ready to compare, the surgeon can examine the plate design, the design of screw holes and the location and orientation screw thwacked into which based on the assembly in Mimics software. After the design of the plate completed, we used UG software for NC programming of the plate, then the NC code generated which was input CNC machine which processed out the design of distal femoral personalized anatomic plate, as well as the reduction of distal femoral bone. Finally, personalized anatomic plate was rigged out with the distal femur bone model, meanwhile, effects of assembly were compared with the standardization of anatomic plate.Results:1. A three-dimensional solid model of complex distal femoral fracture was established. 2. A simulated reduced three-dimensional solid model of complex distal femoral fracture was established. 3. A three-dimensional solid model of distal femoral personalized anatomic plate and a three-dimensional solid model of personalized anatomic plate screw system were established. 4. The distal femoral personalized anatomic plate model and distal femur model were machined.Conclusion:1. A three-dimensional solid model reduction of complex distal femoral fracture was established, applying CT scanning date, the profile of model was realistic and closed to the normal. At the same time, the model can be carried out preoperative planning, guide the clinical diagnosis and treatment in the work. 2. The building of personalized anatomic plate three-dimensional solid model has a good facial fit and a special design of screw holes, demonstrating the application of a great space and prospects for development.