Study On The Planning Of The Screw Channel In The Posterior Column Of The Acetabulum And The Assembled Aiming Device

Acetabular fracture is a fracture of the acetabulum by intraarticular damage caused by high energy,due to the complex anatomy of the acetabulum,the surrounding organs,nerves and blood vessels clouds,acetabular fractures often accompanied by other surrounding organs Injury of nerve,blood vessels and tissues and muscles has serious damage to the anatomical structure of the acetabulum.Therefore,the research on the treatment of acetabular fractures has attracted the attention of many researchers at home and abroad.Early treatment with non-surgical treatment methods,due to the inability to restore the good matching relationship between femoral head and acetabulum and poor efficacy,with the continuous recognition of domestic and foreign acetabular fractures,deepening of learning,and the establishment of current surgical treatment concepts,for complex acetabular fractures advocate surgery,performed anatomical reduction,effective internal fixation and early exercise.Front pillar plate combined with the lag screw in the complex column acetabular fracture,a low-invasive nature,low-operative complications methods,but high requirements surgery,high risk,there are difficulties: perforation of the cortical bone screws or acetabular socket;screw surrounding organ damage during implantation,and neurovascular muscular tissue;screw difficult to determine the direction of the needle;screw implantation process is difficult to maintain a steady state;the effective length of screw placement is not enough,the effect of poor fixation;the need to repeatedly view the X line determination counter The nail position increases the radiation damage of both the doctor and the patient.Therefore,the key to the treatment of posterior acetabular column fracture surgery is how to improve the accuracy and success rate of acetabular posterior column nail placement.At present,there is a complete surgical solution for the fixation of the acetabular anterior column fracture,but in the study of the posterior acetabular column fracture fixation,it has been found that the planned safe nail placement channel interferes with the iliac wing and directly leads to aiming.The consequences of the inability to design the device structure,so the study of scientific,accurate,simple and economical individualized acetabular posterior column nail placement parameters is the key to solving the current acetabular posterior column fracture fixation.The assembled curved positioning type acetabular posterior column nail positioning sight has the functions of helping the doctor to complete the accurate planning of the nail placement channel and accurately guide the bone screw during the operation before the operation.The high-quality sight will make the complex acetabulum Posterior column fracture internal fixation becomes simple,effective,and economical and safe.This article aims to provide this type of clinical surgery with a solution that maximizes the contradiction between personalized needs and mass production,improves the cost-effectiveness of surgery,and enables internal fixation to quickly respond to surgical demands and obtain the best biomechanical performance method.In this study,we discovered that the planned safe positioning of the acetabular posterior column nail positioning sight interferes with the iliac wing.This interference phenomenon also causes the sight size of the sight,especially Consequences of failure to design the main support wall structure size.Aiming at the occurrence of interference,a method for adjusting the rear pillar nailing channel based on the drawing method and the "analysis method + drawing method" is proposed,which is precisely controlled within the safe range of the rear pillar nailing channel.The nail placement channel obtained by using this method is more reasonable and has safer nail placement parameters,which effectively guarantees the safety of nail placement surgery and the biomechanical performance of internal fixation.The channel planning,positioning,quality and use effect of the sight are studied by virtual nail placement and simulated drilling.Good performance results,it is verified on the posterior column staple channel facing surfaces regulatory effectiveness and positioning accuracy stability advantages,the present study shows that based 3D printing technology designed Fabricated curved surface positioned opposite type column acetabulum The nail sight has the comparative advantages of precision and precision stability,and is adapted to the development trend of precision medicine in acetabular fracture internal fixation.