Clinical Study Of 3D Printing-assisted Crowe? DDH For THA Femoral Lateral Treatment

Objective:To explore the clinical value of Crowe type II developmental dysplasia of the hip(DDH)for total hip arthroplasty and the application of 3D printing on the femoral side.Method:A retrospective study was conducted to select 20 patients(20 hips)who underwent total hip arthroplasty with Crowe type II congenital hip dysplasia from September 2016 to September 2018 in the Department of Orthopaedics,First People's Hospital of Chenzhou City),according to whether to use 3D printing technology,divided into two groups A and B(group A: 3D print group;group B: traditional surgery group).Group A: 10 patients(10 hips)were treated with 3D printing before surgery,and the patient's femoral side model was established and the surgery was performed on the model to simulate the surgical procedure.Group B: 10 patients(10 hips)according to the traditional imaging examination method.Perform a surgical procedure.The postoperative acetabular-femoral anteversion angle was compared between the two groups.The preoperative prediction and the matching rate of intraoperative femoral prosthesis models;the incidence of intraoperative femoral condyle fractures;postoperative ground time;postoperative Hospital stay;Harris score before and after surgery.Result:All 20 patients were followed up effectively.The follow-up period was 6-12 months,and the average follow-up time was(9±1.5)months.The acetabular-femoral anteversion angle of the two groups was measured by CT.The group A(46.23±2.60)° and the B group(46.07±2.48)°,there was no statistical difference between the two groups(P>0.05).).In terms of femoral prosthesis matching rate,the preoperative prediction of group A was matched with intraoperative femoral prosthesis in 9 cases(90%),and the preoperative estimation of group B was matched with intraoperative practical femoral prosthesis in 3 cases(30%).The difference between the two groups was statistically significant(P<0.05).There were 0 cases(0%)of femoral condyle fractures in group A and 5 cases(50%)of femoral condyle fractures in group B.There was significant difference between the two groups(P<0.05).The average postoperative time in group A was(3.2±0.4)days.The postoperative hospital stay in group A was(13.0±3.0)days.The average time after surgery in group B was(4.2±1.0)days.The postoperative hospital stay in group B was(16.6±2.5)days,the difference was statistically significant(P<0.05).There were significant differences in Harris scores between the two groups before and after surgery.There was no significant difference in Harris score between the two groups(P>0.05).Conclusion:Preoperative application of 3D printing technology on the femur side,compared with the traditional surgical methods: 1,can improve the preoperative estimated femoral prosthesis model and the actual model of the surgical model;2,can reduce intraoperative femoral fractures Incidence rate;3,can advance the postoperative time of the patient,reduce postoperative hospital stay,and accelerate recovery.