Research On Reconstruction And Simulation Of Lower Limb Bone Model Based On Reverse Engineering

How to effectively treat the femoral neck fracture and improve the osteonecrosis of the femoral head after the treatment of fracture injury is the focus of the current orthopaedic scholars.The combination of reverse engineering and 3D printing technology is an important application research direction in biomedical field,especially in the treatment of human bone injury.In this paper,the matching alignment algorithm is used to repair the fractured femur,according to the principle of reverse engineering,the repaired femur and other lower limb bones are repaired and reconstructed,and the static and dynamic numerical simulation of the repaired bone model was studied,the specific research as follows:(1)Based on the CT data of lower limb bone,median filtering algorithm and Laplace algorithm are used to filter and sharpen the bone,and a three-dimensional bone model is obtained in the medical software Mimics.Based on the three-dimensional model of the bone,the matching alignment algorithm is used to repair the state from the fractured femur to the normal femur,and the three-dimensional model of all the bones of the lower limbs including the repaired femur is reconstructed by using the principle of reverse engineering,the lower limb skeleton were reverse repair processed in Geomagic studio platform,and obtained the relatively perfect lower limb skeleton model,which lays the foundation for the statics and dynamics analysis.(2)According to the model after repair,based on ANSYS static analysis simulation environment,after setting the material and meshing,the strain and stress curves of the reconstructed skeleton model are obtained,and compare with the clinical results,the results show that the strain and stress field of the model are consistent with the clinical situation under the specific load,which verifies the correctness of the model.(3)Using the angle change data of hip joint,knee joint and ankle joint of normal people during walking as reference data,to establish the dynamic model of lower limb bone,by using ADAMS simulation platform,the moment of each joint of the lower limb skeleton are studied,and compared with the actual data of normal walking.The results show that the dynamic parameters of the model are consistent with the actual walking parameters,which proves that the model can meet the normal walking requirements.(4)The femur model before and after repair and tibial model after repair was made by the method of light curing molding in 3D printing technology and the photosensitive resin.The model can provide theoretical support for doctors to directly diagnose the disease,treat the injured bone and make preoperative plan.