Research On Key Technologies Of The Acetabular Component Planning And Surgical Navigation

For total hip arthroplasty,hip prostheses design is the main part of surgical planning and the accurate and fast implantation can be ensured by surgical navigation.The anatomy of pelvis,acetabulum and femur is a key factor in prostheses optimization and is vital to the patient specific planning of the total hip arthroplasty.Based on open-source toolkits,threedimensional automatic measurement algorithms for the morphology of pelvis,acetabulum and femur were proposed.The algorithm for pelvis can solve reference features including pelvic anterior plane and mid-sagittal plane,and establish a standardized pelvic coordinate system.The algorithm for acetabulum can extract the feature of acetabular rim to fit an acetabular circle,and automatically solve key anatomic parameters including rotation center,anteversion and inclination in the pelvic coordinate system.The algorithm for femur can realize the automatic modeling of femoral canal,and automatically compute key anatomic parameters including proximal canal axis,isthmus,anteversion and neck-shaft angle.Clinical experiments and evaluation showed that three computer-aided methods not only solved the tricky practical problem,but also achieved much higher accuracy and faster response than clinical requirements.Moreover,the intra-class correlation coefficients of these methods were higher than 0.955,which indicated a prominent reliability.Based on automatic measurement algorithms,a software "CupGuider" for acetabular prostheses planning was developed,an algorithm for solving acetabular cup coverage and another for modeling of patient specific intraoperative orientation template were proposed.Compared with surgical template,surgical navigation has a more complicated architecture and a wider range of application.A novel imageguided surgical navigation system "IGSurgery" was established,a coordinate system computing framework was proposed,and calibration methods for surgical tools and registration methods for patients were extended.Model experiments and pivot clinical trials showed that the functionality,accuracy and real-time capability of surgical navigation system were capable of completing complex operative tasks.