The Biomechanical And Clinical Study Of Three Internal Fixation Methods For Haraguchi Type ? Posterior Malleolus Fractures

PART ONE BIOMECHANICAL STUDY OF TWO INTERNAL FIXATION METHODS FOR Haraguchi ? POSTERIOR MALLEOLUS FRACTURE(hollow screw VS reconstruction steel plate)Objective:To study bio-mechanical characteristics of two kinds of internal fixation for posterior malleolar fractures of type Haraguchi ?,to find the best fixation method and provide theoretical basis for clinical application.Method:By through making 20 artificial ankle bone of Haraguchi ?for posterior malleolar fractures models,using posterior ankle hollow screw+internal ankle hollow screw(A group 10)and the posterior ankle reconstruction steel plate fixation+internal ankle hollow screw(group B 10),for stress analysis of bio-mechanical experiment,to compare the strengths and weaknesses of fixation of each group.Results:A series of biomechanical properties such as stress intensity,rigidity,fixed torsional mechanical properties,contact mechanics show:group B and group A showed a significant difference(P<0.05),group B was better than group A,while group B strong stiffness and stress levels were close to the normal group.Conclusion:Haraguchi type ? posterior ankle fracture using the posterior ankle reconstruction steel plate has superior bio-mechanical properties than the posterior ankle hollow screw fixation,it is an ideal procedure,and it has clinical guiding significance.PART TWO BIOMECHANICAL STUDY OF TWO INTERNAL FIXATION METHODS FOR Haraguchi ? POSTERIOR MALLEOLUS FRACTURE(cannulated screw VS posterior malleolus support plate fixation)Objective:To study the biomechanical characteristics of two internal fixation methods for Haraguchi ? posterior malleolus fracture and analyze the advantages and disadvantages from the biomechanical point of view to provide sufficient theoretical basis for instrument selection and clinical operation.Methods:Twenty artificial ankle joint bones were used to make a Haraguchi ? posterior malleolus fracture model.We compared the use of posterior malleolus cannulated screws + medial malleolus cannulated screw(Group A,n=10),posterior malleolus support plate fixation+medial malleolus cannulated screw(Group B,n=10),and the original standard normal group(Group N,n = 8)for the biomechanics stress analysis.Results:Haraguchi ? posterior malleolus fracture,posterior malleolus cannulated screws + medial malleolus cannulated screw(Group A),and posterior malleolus support plate fixation + medial malleolus cannulated screw(Group B)had the same biomechanical properties.The biomechanical indicators showed that internal fixation of the posterior malleolus cannulated screw can achieve excellent biomechanical properties with the use of support plate fixation.Conclusion:Haraguchi ? posterior malleolar fracture can achieve the anti-pressure and anti-rotated function of posterior malleolus support plate fixation using the posterior malleolus cannulated screw+medial malleolus cannulated screw fixation,and the operation is simple and convenient.