Three-dimensional Finite Element Analysis Of Different Surgical Treatments For Acromioclavicular Joint Dislocation

Objective:To establish a three-dimensional finite element model of different acromioclavicular joint dislocations and to analyze the mechanical properties of the acromioclavicular joint dislocation.This paper mainly uses the simulation of the two surgical methods of TightRope plate and Orthocord line,and uses Ansys18.0 software to measure the threshold force of re-dislocation of the two operations in vertical,horizontal and axial directions.Combined with clinical studies,analyzes and evaluates different surgical methods for the treatment of acromioclavicular joint dislocation,and it provides a scientific basis for the development of a rational,effective and targeted treatment plan.Methods:This article selects a healthy adult male volunteer,aged 27,with no history of trauma and surgery,no family history of hereditary history,and no chronic history.The trial has obtained informed consent from the participants.The image of the right shoulder joint of the volunteer was scanned using ct,and the boundary of the right shoulder joint bone was obtained by ct scan.The scanned image data is exported and stored in dicom format to obtain a data source for reconstructing the acromioclavicular joint model.Importing CT scan image data in DICOM format into Mimics17 software.A three-dimensional solid mo-del of the scapula,clavicle and tibia was successfully constructed.Through Geomagic Studio12 software,the model is subjected to reverse processing such as joint separation and surface smoothing to obtain a 3D solid model with clear image,smooth appearance,realistic shape,relatively accurate spatial position and observation at any angle.The ligament model was then established based on the size and attachment points of the acromioclavicular ligament,the coracoclavicular ligament(conical ligament,trapezoidal ligament),and the rostral shoulder ligament.In this paper,a three-dimensional finite element model of the acromioclavicular joint was created by Ansys18.0 software.The acromioclavicular ligament and the sacral ligament were removed to simulate the acromioclavicular joint dislocation and the above two surgical models were established.The bones and ligaments were defined according to the experimental requirements and references.They are all orthogonally isotropic elastoplastic materials,and the relevant parameters of each material are set,and the threshold forces of redislocation in the vertical,horizontal and axial directions of the two operations are calculated respectively,and the change of the shackle spacing in the vertical direction is measured.Combined with clinical research,different surgical methods for analyzing and evaluating the treatment of acromioclavicular joint dislocation,and provide scientific basis for clinically effective,effective and targeted treatment.Results:Through the three-dimensional finite element calculation,it is found that the threshold force of the TightRope plate type re-dislocation in the vertical direction is 493 N,the coracoclavicular spacing is shifted upward by 3.05mm(the coracoclavicular spacing of normal model is 10.56 mm),and the threshold force of re-dislocation in the horizontal direction is150 N,and dislocation in the axial direction.The threshold force is 150N;the threshold force of the Orthocord line re-dislocation in the vertical direction is 800 N,the coracoclavicular spacing is shifted upward by 1.68 mm,and the threshold force in the horizontal direction is 720 N,which is dislocated in the axial direction.The threshold power is 850 N.It can be found that the threshold force of the Orthocord line in the vertical,horizontal and axial directions is significantly greater than that of the TightRope plate,indicating that the Orthocord line is more secure than the TightRope plate.Under the action of vertical load,the TightRope steel plate is used when the internal fixing material breaks(the internal fixing material breaks),the coracoclavicular spacing is 13.61 mm,which is up 28.88%.Under the action of vertical load,the Orthocord line is used when the internal fixing material breaks(the internal fixing material breaks),the coracoclavicular spacing is 12.24 mm,which is up 15.91%.In the case of a larger load,the Orthocord line moves up to a smaller distance than the TightRope plate,further indicating that the Orthocord line is more secure than the TightRope plate.The threshold force of the TightRope plate procedure for re-dislocation in the horizontal and axial directions is relatively small,which is caused by the shearing action of the clavicular and condylar bones on the internal fixation material,making it at the clavicular orbital or condylar bone.The Orthocord line surgery may only have a shearing effect on the clavicular bone.The probability of rupture at the clavicular ostium is slightly higher than that at other locations.Because it is multi-stationary,the stress is relatively dispersed and the Orthocord line can be The condyle surface and the clavicular bone slide slightly,so the threshold of the fracture is larger.In addition,it was observed that the two surgical methods only showed re-dislocation when the internal fixation was broken by calculation,and there was no clavicular or condylar fracture during the calculation.Combined with clinical,both surgical methods can achieve satisfactory reduction.Arthroscopic TightRope plate treatment of acromioclavicular joint dislocation has the advantages of small trauma,quick recovery,no need for secondary surgery to remove internal fixation,and aesthetics.However,the material is expensive and the arthroscopic technique has a long learning period;the Orthocord line has the advantages of quick recovery,no need for secondary surgery to remove internal fixation,low material cost,easy operation,etc.,but the trauma is slightly larger than that of arthroscopic surgery.Conclusion:1.The threshold force of Orthocord line re-dislocation is significantly larger than that of TightRope plate.Orthocord line fixation is more reliable.2.Both surgical methods can achieve satisfactory reduction and firm fixation for acromioclavicular joint dislocation.The advantages and disadvantages of different surgical methods are selected to be more suitable for patients’ surgery.3.Three-dimensional finite element analysis can simulate different surgical methods for the treatment of acromioclavicular joint dislocation,objectively calculate the threshold force of dislocation of different surgical modes,and evaluate the surgical results valuably.And it can provide a scientific basis for clinical work,and then we can make a more reasonable,effective and targeted treatment plan.