3D Printing For Complex Plan Before Hip Replacement Guiding Significance

Background In total hip replacement, reconstruction repairing bone defect of the acetabulum is still a challenging issue. Traditional imaging data can not be accurate and comprehensive on the situation to assess acetabular defects.3D printing technology in accordance with the 1:1 ratio in patients with lesions of the print model can accurately reflect the overall disease situation. There have been some 3D printing in preoperative planning application reports in domestic and foreign.Objective Use the patients’CT image data to reverse modeling, printed 3D model of the lesion site by 3D printer. The use of 3D models to assess acetabular defects situation and preoperative planning and surgical drill,and compared with the actual situation in the operation, to explore the significance of 3D printing technology planning of complex hip surgery.Methods Based on clinical study of typical cases. Select our department seven patients with unilateral hip surgery as research subjects, seven hips. The "merger of acetabular dysplasia Osteoarthritis" two patients underwent total hip arthroplasty; "Hip arthroplasty prosthesis loosening" two patients underwent revision hip arthroplasty; "Hip arthroplasty acetabular cup fragmentation" one patients underwent total hip arthroplasty; "Avascular necrosis" two patients underwent hip replacement surgery. Preoperative ipsilateral hip CT scan, exporting image data in DICOM format, use the interactive medical imaging control system Mimics software, construction of three-dimensional model of reverse bone. Import the data into printer, getl:1 3D model of hip with the patient size. The use of 3D models to develop preoperative planning and surgical drill, and compared with the actual situation of surgery.Results Seven patients underwent preoperative ipsilateral hip 3D printing and preoperative surgical planning and preoperative exercise according to the model.3D model of the bone defect by typing preoperative consistent with the actual situation surgery; Preoperative acetabular reconstruction program developed by 3D model consistent with the actual surgery program; Preoperative and postoperative hip scores as a paired t-test, P<0.05, the difference was statistically significant, good surgical results. Radiological follow-up showed no significant loosening or osteolysis was observed in imaging analysis of the patients included in the study.Conclusion 3D printing models that of 1:lin patients with lesions of hip, allowing doctors more intuitive assessment of the patient’s acetabulum, and a more accurate classification of bone defects. Preoperative exercise on the model, not only to develop acetabular reconstruction program, but also let the doctor have a clearer grasp during surgery, has played a positive role in guiding for operation plan.