Biomechanical Study And Clinical Analysis Of Ankylosing Spondylitis Kyphosis Correction

Objective: the application of computer aided simulation software of ankylosing spondylitis kyphosis osteotomy surgery,biomechanical analysis,combined with clinical analysis of pedicle vertebral osteotomy clinical correction of ankylosing spondylitis kyphosis.Methods: 1 cases of ankylosing spondylitis kyphosis patients as the research object,CT scan image of C1 to sacrococcyx,CT image data into Mimics 17 modeling software,the initial establishment of kyphosis 3D model into ANSYS 15 finite element analysis software,set the material parameters,convex three-dimensional finite element model to generate the complete ankylosing spondylitis.In the model,two kinds of angle of vertebral body were simulated to calculate the biomechanics of the spine.Combined with the clinical retrospective analysis of February 2010 March-2015 in our hospital from 38 cases of pedicle vertebral osteotomy for the treatment of the patients were male gender,age 21-55 years old,average 37.2 years old,were measured in whole spine kyphosis,maximum thoracic kyphosis,thoracolumbar kyphosis,lumbar kyphosis angle and sagittal balance correction distance evaluation effect of using JOA and ODI score method to evaluate the surgery efficacy and quality of life.Results: the threedimensional finite element model of the complete ankylosing spondylitis was established successfully,and the two types of vertebral pedicle osteotomy were simulated and analyzed by finite element method.The osteotomy angle is 40 degrees under the condition were significantly higher than the 32.2 degree stress rod each of the screw and titanium,GK patients(total spine maximum COBB angle)preoperative 54.2 degrees to 8.4 degrees correction amp after 12 DEG amp 4 degrees(P<0.05),the difference was statistically significant TL(thoracolumbar angle),preoperative 28.2 degrees to 7.9 degrees correction amp after 4.6 DEG amp 3.8 degrees(P<0.05),LL(lumbar lordosis)before operation,-28.4 degrees to 17.3 degrees after correction of amp 22.3 amp 18.2 degrees(P<0.05).SVA(sagittal balance)before operation,38.1 amp 13.3 amp 9.2 postoperative corrected to 4.3(P<0.05).At the last follow-up,the parameters were compared with the postoperative(P < 0.05),the difference was not statistically significant.The JOA score from preoperative 12.8 to postoperative 27.6 amp 4.9 improvement amp 4.7(P<0.05),ODI score from preoperative 14.6 to postoperative 4.5 amp 3.2 improvement amp 2.8(P<0.05),the difference was statistically significant,the last follow-up shot full spine X-ray showed good internal fixation.Conclusion: using the method of calculation in hilar hip axis osteotomy angle measurement is a scientific method,in the premise of orthopedic effect with lower stress and internal fixation,pedicle vertebral osteotomy correction of ankylosing spondylitis kyphosis is a safe and effective surgical methods,...