有限元分析Ilizarov技术对肘膝关节屈伸挛缩畸形矫正器作用的机制

背景：目前国内外鲜见采用有限元法分析Ilizarov技术在骨科疾病肢体延长及对关节挛缩外固定器的作用机制。 目的：利用三维有限元分析Ilizarov技术对肘膝关节屈伸挛缩畸形矫正器的作用机制。 方法：利用Ilizarov生物学理论设计出的符合人体生物力学特性和可以广泛应用于临床的关节挛缩矫正器。通过三维有限元分析应用Ilizarov技术在肘膝关节屈伸挛缩畸形矫正器设计中的力学有效性和科学性。 结果与结论：建立了几何外型逼真、生物力学特性全面的肘膝关节三维有限元模型。通过三维有限元模型及力学分析计算出各组织包括骨与软组织的弹性模量和泊松比等力学指标,可通过施加关节挛缩矫正器的载荷分析其关节内、外的应力-应变分布及变化情况。Ilizarov技术可对肘膝关节挛缩畸形矫正器的设计与优化改良提供理论依据,利用有限元力学分析揭示了肘膝关节屈伸挛缩畸形病变组织结构的生物力学变化中的机制。

Action mechanism of Ilizarov technique in deformity correction device for elbow and knee flexion extension contracture by finite element analysis

BACKGROUND:At present, few researches have reported the effect mechanism of IIizarov technique in orthopedic disorders limb lengthening and joint contracture external fixation device by finite element analysis. OBJECTIVE:To analyze the effect mechanism of Ilizarov technique in deformity correction device for elbow and knee flexion extension contracture by three-dimensional finite element analysis. METHODS:The joint contracture correction device based on the human body biomechanical properties which can be widely applied to clinical treatment was established by IIizarov biological theory. The mechanical effect and scientificity of Ilizarov technique in the designing of the deformity correction device for elbow and knee flexion extension contracture were analyzed by three-dimensional finite element. RESULTS AND CONCLUSION:A three-dimensional finite element model of elbow and knee joints with realistic appearance and full biomechanical properties were established. The mechanical indexes, such as the elastic modulus and Poisson’s ratio of the bone and soft tissue were calculated through the three-dimensional finite element model and the mechanical analysis. Joint internal and external stress-strain distribution and changes were analyzed through imposing load on the joint contracture correction device. Ilizarov technique can provide the theory basis for the designing and optimizing deformity correction device for elbow and knee flexion extension contracture, and the finite element mechanics analysis reveals the biomechanical change mechanism of elbow and knee flexion contracture lesions organizational structure.