Optimization Of Acetabular Nail Sight Channel Parameters Based On Point Cloud Data

There are large individual differences in the morphology of the acetabulum.The position of the acetabulum is deep,the anatomical structure is complex,and the surrounding reticular nervous system,vascular system and complex muscle tissue are dense.In the internal fixation of acetabular fractures,screw placement It may cause damage to the nervous system,surrounding organs and blood vessels,so the key to the operation is the efficiency,accuracy and scientificity of the acetabular nail channel planning.The current multi-section control method of the acetabular double-column nail channel and the control method of the posterior-post nail channel have many shortcomings.This article proposes a planning method based on high-density point cloud data,related theories,software built-in functions,and self-programming.Realize the global optimization of the total length of the acetabular double-column nail channel.The current personalized acetabular nail sighting device designs and manufactures positioning curved surfaces based on FDM-3D printing technology to ensure positioning accuracy and accuracy stability,and then introduces the above methods into its design and manufacture,and can be selected under the premise of safe nail placement Standard bone screws as large as possible to obtain the best biomechanical performance,provide reliable theoretical support and technical methods for the popularization and application of personalized acetabular nail sights.This article describes the current multi-section adjustment method of the acetabular double-column nail passage and the adjustment method of the posterior-post nail passage.The analysis points out that the global optimization of the nail passage cannot be achieved and the “analytic method + operation ” of the posterior column The lack of sufficient mathematical theoretical support in the control of the "graphic method" has caused the main problems that the positioning accuracy is not high,the stability is not high,and the efficiency is not high.It is also a bottleneck that hinders the popularization and application of the acetabular nail sight.This article conducts experimental research on the above issues.The main research content and research results are as follows:(1)Proposed a method to accurately find the acetabular nail in and out points under the environment of UG 12.0 and Imageware 13.2 and set a reference plane perpendicular to the least squares line to cut the hip bone double-column model to obtain the operation area;The functions of "section curve" and "curve projection" obtain the largest inscribed circle and plan the method for the largest inscribed cylinder of the acetabular double column.(2)The reason for the wall breaking phenomenon caused by virtual nail placement based on the multi-section control planning method is explained.Improved the method of taking the normal section through the center point of the acetabular socket as the starting surface of the equidistant normal section;through the virtual simulation and comparison of the nail placement effect,the closed contour shape and its shape obtained based on the 7-section and 11-section control planning method The parameters of the largest inscribed circle.(3)Propose a method for acetabular nail placement channel planning based on spiral CT point cloud data.Theoretically explained the necessity of point cloud acquisition,proposed a method for preprocessing the spiral CT point cloud data of the acetabular anterior column;proposed a Matlab-based global optimization planning method for the acetabular anterior column nail channel,and introduced related Theoretical basis of Matlab;self-compiled Matlab related programs and introduced the key codes and operating skills in Matlab programming.(4)The rigorous mathematical formulas were derived for the relevant parameters in the analytical control method of the post-post nail passage,and were verified in the follow-up virtual control experiment.(5)A virtual experiment of the analytic regulation and control method of the post-post nailing channel was carried out,and the virtual nailing effect was observed in the experiment.